Updated 180922 (p:15-16, refs. & p:50-51) CH3Br, VMI-REMPI, 2016: https://notendur.hi.is/~agust/rannsoknir/Crete16/PPT-160904-CH3Br(1).pptx Content: (ca.) pages Plan according to application………………………………………………. 2-4 From T. Ridley´s paper, 2008 on CH3Br……………………………….. 5-6 Our paper, 2010 on CH3Br………………………………………………….. 7-13 Mass spectra vs. REMPI spectra………………………………………….. 14 I(M+)/I(CH3+) (M = CH, Br, CBr) vs CH3+ REMPI spectrum……… 15-16, 50 Important papers………………………………………………………………… 17-18 Peak positions vs. Spectra (T. Ridley & OURS)…………………….. 19-25 Mass vs. REMPI spectra………………………………………………………. 26 Comments concerning REMPI and Mass spectra………………… 27 CH3, CH3+, CH3Br, CH3Br+ vibrational and e-states ……………. 28-32 CH3-Br bond energies vs. literature……………………………………….. 33 Exp. Progress vs. dates……………………………………………….............. 34-37 Check list for experimental progress and processing work…….. 38 Br and Br* detections / resonances, transitions…………………… 39-40 KER basic formulas……………………………………………………………….. 41-43 processing procedures (examples)………………………………………….. 44-45 CH3 detection…………………………………………………………………………. 46 Thresholds………………………………………………………………………………. 47-48 scanning ranges vs. thresholds (semi-schematic)……………………. 51 Updated 180922 (p:15-16, refs. & p:50-51)

Application text/ plans etc.: To top

Application text/ plans etc.: To top

Application text/ plans etc.: To top

https://notendur. hi. is/~agust/rannsoknir/papers/jpcA112-7170-08 https://notendur.hi.is/~agust/rannsoknir/papers/jpcA112-7170-08.pdf (T. Ridley et al. CH3Br paper, 2008) To top

To top :

To top https://notendur.hi.is/~agust/rannsoknir/papers/jpcA114-9991-10.pdf ; our CH3Br paper

To top https://notendur.hi.is/~agust/rannsoknir/papers/jpcA114-9991-10.pdf ; our CH3Br paper

https://notendur. hi. is/~agust/rannsoknir/papers/jpcA114-9991-10 https://notendur.hi.is/~agust/rannsoknir/papers/jpcA114-9991-10.pdf ; our CH3Br paper To top

https://notendur. hi. is/~agust/rannsoknir/papers/jpcA114-9991-10 https://notendur.hi.is/~agust/rannsoknir/papers/jpcA114-9991-10.pdf ; our CH3Br paper To top

https://notendur. hi. is/~agust/rannsoknir/papers/jpcA114-9991-10 https://notendur.hi.is/~agust/rannsoknir/papers/jpcA114-9991-10.pdf ; our CH3Br paper To top

https://notendur. hi. is/~agust/rannsoknir/papers/jpcA114-9991-10 https://notendur.hi.is/~agust/rannsoknir/papers/jpcA114-9991-10.pdf ; our CH3Br paper To top

https://notendur. hi. is/~agust/rannsoknir/papers/jpcA114-9991-10 https://notendur.hi.is/~agust/rannsoknir/papers/jpcA114-9991-10.pdf ; our CH3Br paper To top

Mass spectra vs. CH3 REMPI spectra: Ref: agust, heima,..ritsmidar/CH3Br(II)/ CH3Br-II-090310.doc; Fig. 2

I(CH+)/I(CH3+) vs CH3+ REMPI spectrum Ref: agust, heima,..ritsmidar/CH3Br(II)/ CH3Br-II-090310.doc; Fig. 3(a) & agust, heima,..ritsmidar/CH3Br(II)/Figs/Fig.3/CH3REMPI-100210vhw-090310ak.pxp; Lay2, Gr9 https://notendur.hi.is/~agust/rannsoknir/Crete16/PXP-180922.pxp ; Lay2, Gr9

I(M+)/I(CH3+) (M = Br, CBr) vs CH3+ REMPI spectrum Ref: agust, heima,..ritsmidar/CH3Br(II)/ CH3Br-II-090310.doc; fig. 3(b) & agust, heima,..ritsmidar/CH3Br(II)/Figs/Fig.3/CH3REMPI-100210vhw-090310ak.pxp; Lay3, Gr10 https://notendur.hi.is/~agust/rannsoknir/Crete16/PXP-180922.pxp ; Lay3, Gr10

Information / Content: Important papers: To top Papers Information / Content: https://notendur.hi.is/~agust/rannsoknir/papers/jpcA112-7170-08.pdf T. Ridley et al.: REMPI spectra etc. https://notendur.hi.is/~agust/rannsoknir/papers/jpcA114-9991-10.pdf A. Kvaran et al.: REMPI spectra, etc. https://notendur.hi.is/~agust/rannsoknir/papers/jcp108-5742-98.pdf T.N. Kitsopoulos et al. Photodissociation study of CH3Br in the first continuum https://notendur.hi.is/~agust/rannsoknir/papers/pccp1-747-00.pdf I. Powis et al.; Photofragmentation of CH3Br in the red wing of the first continuum absorption band https://notendur.hi.is/~agust/rannsoknir/papers/pccp16-599-14.pdf T.N. Kitsopoulos et al., Slice imaging of methyl bromide photofragmentation at 193 nm https://notendur.hi.is/~agust/rannsoknir/papers/rsi72-3848-01.pdf T.N. Kitsopoulos et al., Slice imaging: A new approach to ion imaging and velocity mapping https://notendur.hi.is/~agust/rannsoknir/papers/jcp130-244306-09.pdf Christelle Escure et al., Ab initio study of valence and Rydberg states of CH3Br https://notendur.hi.is/~agust/rannsoknir/papers/jcp062-848-75.pdf Causley and Russell, Vacuum ultraviolet absorption spectra of the bromomethanes https://notendur.hi.is/~agust/rannsoknir/papers/jcp115-4095-01.pdf Y. Song et al., High-resolution energy-selected study of the reaction CH3X+ ->CH3+ + X: Accurate thermochemistry for the CH3X/CH3X+ (X=Br, I) system https://notendur.hi.is/~agust/rannsoknir/papers/jcp140-044312-14.pdf Xiaofeng Tang et al. Dissociation of internal energy-selected methyl bromide ion revealed from threshold photoelectron-photoion coincidence velocity imaging https://notendur.hi.is/~agust/rannsoknir/papers/pccp11-2234-09.pdf T.N. Kitsopoulos et al., Multiphoton dissociation dynamics of CH3Br https://notendur.hi.is/~agust/rannsoknir/papers/jcp130-034304-09.pdf V. Blanchet et al., https://notendur.hi.is/~agust/rannsoknir/papers/jcp130-034304-09.pdf https://notendur.hi.is/agust/rannsoknir/papers/jcp122-104310-05.pdf Bailin Zhang, Jinghui Zhang, and Kopin Liu; Imaging the “missing” bands in the resonance-enhanced multiphoton ionization detection of methyl radical

Information / Content: Important papers: To top Papers Information / Content: https://notendur.hi.is/agust/rannsoknir/papers/jcp79-571-83.pdf Jeffrey W. Hudgens, T. G. DiGiuseppe, and M. C. Lin; Two photon resonance enhanced multiphoton ionization spectroscopy and state assignments of the methyl radical https://notendur.hi.is/~agust/rannsoknir/papers/cp163-277-92.pdf Wayne P. Hess, David W. Chandler and John W. Thoman Jr.; Photofragment imaging: the 205nm photodissociation of CH3Br and CD3Br https://notendur.hi.is/~agust/rannsoknir/papers/cp92-59-85.pdf G.N.A. Van Veen, T. Baller and A.E. De Vries: Photofragmentation of CH3Br in the A band. https://notendur.hi.is/~agust/rannsoknir/papers/jcp127-224310-07.pdf M. Laura Lipciuc and Maurice H. M. Janssen; High-resolution slice imaging of quantum state-to-state photodissociation of methyl bromide https://notendur.hi.is/~agust/rannsoknir/papers/pccp18-17054-16.pdf Sonia Marggi Poullain, David V. Chicharro, Alexandre Zanchet, Marta G. González, Luis RubioLago, María L. Senent, Alberto García-Vela and Luis Bañares; Imaging the photodissociation dynamics of the methyl radical from the 3s and 3pz Rydberg states

n = 5 [3/2]np;w 6 7 2 w = n3 n2 n1 n3 n2 5 [1/2]np;w 6 2 2 n3 n2 4 Bands according to https://notendur.hi.is/~agust/rannsoknir/papers/jpcA112-7170-08.pdf (T. Ridley et al. CH3Br paper, 2008) To top 66019 75686 75905 n = 5 [3/2]np;w 6 7 2 w = n3 n2 n1 n3 n2 5 [1/2]np;w 78370 6 79610 2 2 n3 n2 68461 68684 78225 72977 80640 80758 4 [3/2]nd;w 6 2 2 2 n3 n2 n1 4 [1/2]nd;w 5 72655 2 75418 78401 n3 n2 78193 80674 80881 https://notendur.hi.is/~agust/rannsoknir/Crete16/CH3Br REMPI spectra-160906.pxp; Gr:0; Lay:0

n = 5 [3/2]np;w 6 7 2 w = n3 n2 n1 n3 n2 5 [1/2]np;w 6 2 2 n3 n2 Bands according to our assignments To top 68882 77165 n = 5 [3/2]np;w 6 7 2 w = n3 n2 n1 n3 n2 5 [1/2]np;w 6 66503 67275 2 2 n3 n2 [3/2]nd;w 69947 4 6 2 2 2 n3 n2 n1 4 [1/2]nd;w 5 74249 2 n3 n2 76689 https://notendur.hi.is/~agust/rannsoknir/Crete16/CH3Br REMPI spectra-160906.pxp; Gr:0; Lay:0

One-color detection work / ion detection: 66019 75686 75905 68882 77165 n = 5 [3/2]np;w 6 7 2 w = n3 n2 n1 n3 n2 5 [1/2]np;w 78370 6 79610 66503 67275 2 2 n3 n2 68461 68684 78225 72977 80640 80758 4 [3/2]nd;w 69947 6 2 2 2 n3 n2 n1 4 [1/2]nd;w 5 72655 74249 2 75418 78401 n3 n2 78193 80674 80881 76689 https://notendur.hi.is/~agust/rannsoknir/Crete16/CH3Br REMPI spectra-160906.pxp; Gr:0; Lay:0

Two-color detection work: 66019 75686 75905 68882 77165 n = 5 [3/2]np;w 6 7 2 w = n3 n2 n1 n3 n2 5 [1/2]np;w 78370 6 79610 66503 67275 2 2 n3 n2 68461 68684 78225 72977 80640 80758 4 [3/2]nd;w 69947 6 2 2 2 n3 n2 n1 4 [1/2]nd;w 5 72655 74249 2 75418 78401 n3 n2 78193 80674 80881 76689 https://notendur.hi.is/~agust/rannsoknir/Crete16/CH3Br REMPI spectra-160906.pxp; Gr:0; Lay:0

One-color detection work / e- detection: 66019 75686 75905 68882 77165 n = 5 [3/2]np;w 6 7 2 w = n3 n2 n1 n3 n2 5 [1/2]np;w 78370 6 79610 66503 67275 2 2 n3 n2 68461 68684 78225 72977 80640 80758 4 [3/2]nd;w 69947 6 2 2 2 n3 n2 n1 4 [1/2]nd;w 5 72655 74249 2 75418 78401 n3 n2 78193 80674 80881 76689 https://notendur.hi.is/~agust/rannsoknir/Crete16/CH3Br REMPI spectra-160906.pxp; Gr:0; Lay:0

One-color detection work / e- detection: 66019 75686 75905 68882 77165 n = 5 [3/2]np;w 6 7 2 w = n3 n2 n1 n3 n2 5 [1/2]np;w 78370 6 79610 66503 67275 2 2 n3 n2 68461 68684 78225 72977 80640 80758 4 [3/2]nd;w 69947 6 2 2 2 n3 n2 n1 4 [1/2]nd;w 5 72655 74249 2 75418 78401 n3 n2 78193 80674 80881 76689 https://notendur.hi.is/~agust/rannsoknir/Crete16/CH3Br REMPI spectra-160906.pxp; Gr:0; Lay:0

CH3+ REMPI spectra (1/2)6p w = 2 0 5d (3/2)6d w = 2 0 To top https://notendur.hi.is/~agust/rannsoknir/Crete16/CH3Br REMPI spectra-160906.pxp; Gr:0; Lay:0

Mass spectra normalized with respect to the CH3+ peaks: To top E / cm-1 CHn+ n=1,2,3 iBr+ (i=79,81) CiBr+(i=79,81) CH3+ + Br- 76822 cm-1 x 2.5 Intensity 13 15 Mw / amu 79 91 https://notendur.hi.is/~agust/rannsoknir/Crete16/CH3Br Mass vs. REMPI-160906.pxp; Gr:22, Lay:12

To top Comments: Relative contributions of fragment ions, other than CH3+ and CBr + (i.e. CHn+ (n = 1,2) and Br+ ), -increase as 2hn increases from 66019 cm-1 to the CH3+ + Br- threshold (76822 cm-1) -decreases sharply as 2hn increases from the CH3+ + Br- threshold (76822 cm-1) for unknown reasons. Spectral features close to the CH3+ + Br- threshold (76822 cm-1) are particularly broad, (see slides 14-16) suggesting that lifetimes shorten, hence that dissociation channels open up (?) It is of interest to see whether / how images of fragments (in general) vary with 2hn on both sides of the CH3+ + Br- threshold (76822 cm-1). An additional CH3+ formation channel corresponding to ion-pair formations (CH3+ + Br- ) might appear above the CH3+ + Br- threshold (76822 cm-1) A Br- formation channel corresponding to ion-pair formations (CH3+ + Br- ) might appear above the CH3+ + Br- threshold (76822 cm-1)

Methyl Radical, CH3 Vibrational states of the ground electronic state To top Methyl Radical, CH3 Vibrational states of the ground electronic state http://webbook.nist.gov/cgi/cbook.cgi?ID=C2229074&Units=SI&Mask=800#Electronic-Spec

*3 *6 *5 *2 *4 * Methyl Radical, CH3 electronic state To top https://notendur.hi.is/~agust/rannsoknir/papers/jcp96-3610-92.pdf https://notendur.hi.is/~agust/rannsoknir/papers/cpl370-204-03.pdf http://webbook.nist.gov/cgi/cbook.cgi?ID=C2229074&Units=SI&Mask=800#Electronic-Spec

http://webbook. nist. gov/cgi/cbook. cgi http://webbook.nist.gov/cgi/cbook.cgi?ID=C14531534&Units=SI&Mask=800 CH3+

To top CH3Br: http://webbook.nist.gov/cgi/cbook.cgi?ID=C74839&Units=SI&Mask=800#Electronic-Spec

CH3Br+: To top http://webbook.nist.gov/cgi/cbook.cgi?ID=C12538704&Units=SI&Mask=800#Electronic-Spec

D0 DD0 CH3Br --> CH3 + Br 24585 176 https://notendur.hi.is/~agust/rannsoknir/papers/2010-91-CRC-BDEs-Tables.pdf 23400 133 https://notendur.hi.is/~agust/rannsoknir/papers/jcp127-224310-07.pdf 23741 669 https://notendur.hi.is/~agust/rannsoknir/papers/disocia.pdf 25217 35 https://notendur.hi.is/~agust/rannsoknir/papers/ACR36-255-03.pdf 24728 140 Roux 24164 16 https://notendur.hi.is/~agust/rannsoknir/papers/jcp115-4095-01.pdf 24306 195

To top Exp. Progress:

To top date Exp. work nm (MOBO scale) Comments/ref. 5.9 Mo Preparation work/ paper work See also checklist at https://notendur.hi.is/~agust/rannsoknir/Crete16/XLS-160912.xlsx 6.9 Tue 1 color exp, 2hv = 66019 (Ry) 303.003 MOBO 7.9 We 1 color exp, 2hv = 72977 (Ry) 274.140 MOBO; power supply broke down 8.9 Thu 1 color exp, 2hv = 66503 (Ry) 300.813 (Use exc. + dye laser); Used MOBO, weak signal; nevertheless a good CH3 image and KER spectrum 9.9 Fri Leak Plan to do the Ry(68684 )peak; not success. 10.9 Sa - 11.9 Su 12.9 1 color exp. 2hv=78370(Ry) 255.230 Measured CH3+,CH2+,CH+, 79Br+, C79Br+ (NB: center = 685,535) 13.9 1 color exp. 2hv = 67275(Ry) 297.324 CH3+(shows rings), CH2+ (shoulders and A peak), CH+ 79Br+, C79Br+, C81Br+ (CH279Br+) 14.9 2hv = 68684(Ry) & 2hv = 75905(Ry) 291.231 263.550 CH3+,CH2+, CH+, 79Br+, C79Br CH3+,CH2+, CH+, 79Br+ 15.9 1 color exp. 2hv=74249, 2hv=77165 Try some broad peaks CH3+,CH2+ CH3+,CH2+,79Br+ 16.9 1 color exp. 2hv=79610 2hv=78339 2hv=78431 CH3+,CH2+,79Br+ CH3+ CH3+

To top date Exp. work Center used Comments/ref: 19.9 Mo 2 color exp. probing Br Ry(66019), 533,357 nm (laser scale) Br resonance Alignment work; no reliable results 20.9 Tue MOBO being fixed; Nozzle being fixed 21.9 We 2 color exp. for Br probing Ry(66019; 303.003) Ry(67275; 297.324) Ry(72977;274.140) 22.9 Thu 2 color exp. for Br probing Ry(68684; 291.231) Ry(75905; 263.550) 23.9 Fri MOPO not working Problems with laser 24.9/25.9 Sa/ Su AK: Three mountains; AH: Heraklion 26.9 2 color exp. Br probing; plan: Ry(79610:251.279) Ry(77165; 259.232) Did not work 27.9 2 color exp. Br probing; plan : Ry(79610:251.279) Ry(77165; 259.232) 2 color exp. Br* probing; plan : Ry(72977;274.140) Did notwork, Mopo too weak power : NO OK, worked 28.9 2 color exp. Br* probing; plan : Ry(68684; 291.211) 29.9 2 color exp. Br* probing; plan : Ry(75905;263.550) Ry(66019;303.000) OK OK; AH & AK left for Iceland 30.9 2 color exp. Br* probing: Ry(67275;297.323) OK 1.10 Sa 2.10 Su

To top date Exp. work Center used Comments/Refs: 7.10 Fri 1 color exp. (dye laser) 2hv = 66019 (Ry) / problem with MOPO 13.10 Thu PES spectra 14.10 / problem with MOPO and Dye laser 8.11 Tue 2 color exp. for CH3 (000)probing Ry(72977; 274.14) Noisy spectrum 10.11 2 color exp. for CH3 (211)probing Ry(72977; 274.14)

Check-list for experimental progress and processing work: To top See: https://notendur.hi.is/~agust/rannsoknir/Crete16/XLS-160912.xlsx Appearance, 13.9.2016:

Two-color experiments, Br and Br* detections: Br: Dye laser = 533.358nm => 266.6784nm (SHG) => 2hv = 74996.6720 cm-1 Br*: Dye laser = 533.484nm => 266.7420nm (SHG) => 2hv = 74978.8185 cm-1 To top Exp. Difference= 12.5 cm-1 75009.13 Difference= 12.6 cm-1 74991.41 https://notendur.hi.is/~agust/rannsoknir/Crete16/XLS-160912.xlsx; sheet = „various things“

Dye lasers / probe transitions To top Dye lasers / probe transitions [3/2]np;w [1/2]np;w [3/2]nd;w n3 n2 [1/2]nd;w 74991.41 75009.13 Br* Br**(2D3/2) Br Br**(4P3/2) https://notendur.hi.is/~agust/rannsoknir/Crete16/XLS-160912.xlsx; sheet = „various things“ https://notendur.hi.is/~agust/rannsoknir/Crete16/CH3Br REMPI spectra-160906.pxp; Gr:0; Lay:0

KERtotal = KERBr + KERCH3 KERBr= mCH3/mCH3 Br* KERtotal To top KERtotal = KERBr + KERCH3 KERBr= mCH3/mCH3 Br* KERtotal KERCH3= mBr/mCH3 Br* KERtotal hv Eint(CH3) = internal energy of CH3 CH3 + Br D0 CH3Br KERtotal = hv – D0 - Eint(CH3) KERBr = mCH3/mCH3 Br (hv – D0 - Eint(CH3)) KERCH3= mBr/mCH3 Br(hv – D0 - Eint(CH3)) https://notendur.hi.is/~agust/rannsoknir/papers/pccp16-599-14.pdf

KERt = 0 KERtotal = KERBr + KERCH3 = 0 KERBr= mCH3/mCH3 Br* KERtotal= 0 KERCH3= mBr/mCH3 Br* KERtotal = 0 Eint(CH3) = internal energy of CH3 = hv – D0 hv CH3 + Br D0 CH3Br https://notendur.hi.is/~agust/rannsoknir/papers/pccp16-599-14.pdf

KERt = hv – D0 „the CH3 + Br threshold“ for the „Br+ KER“ KERtotal = hv – D0 KERBr= mCH3/mCH3 Br (hv – D0) KERCH3= mBr/mCH3 Br (hv – D0) hv Eint(CH3) = internal energy of CH3= 0 CH3 + Br D0 CH3Br https://notendur.hi.is/~agust/rannsoknir/papers/pccp16-599-14.pdf

Various processing procedures (examples): 90

Various processing procedures (examples): See also: https://notendur.hi.is/~agust/rannsoknir/Crete16/PPT-160921-CH3Br(3).pptx Slides 3-4

CH3 detection: 1) 2) Notes from 070916;1 (in Crete): use 211, 222, 233. ; see definition: https://notendur.hi.is/~agust/rannsoknir/acetylene/assignment.jpg https://notendur.hi.is/~agust/rannsoknir/papers/pccp16-599-14.pdf

Lowest energy formation threshold: Second lowest Formation threshold: Third lowest formation threshold fourth lowest formation threshold fifth lowest formation threshold sixth lowest formation threshold C+ 152927 (C++HBr+H2+e-) 156073 (C++H+H2+Br-) 183237 (C++H+H2+Br+e-) 189222 (C++2H+HBr+e-) 192397.9 (C++3H+Br-) 219532 (C++3H+Br+e-) CH+ 123115 (CH++H2+Br-) 150249 (CH++H2+Br) 156234 (CH++H+HBr+e-) 159409.9 (CH++2H+Br-) 186544 (CH++2H+Br+ +e-) CH2+ 115987 (CH2+ + HBr) 119162.9 (CH2+ + H + Br-) 146297 (CH2++H+Br) CH3+ 76818.3 (CH3++Br-) 103953 (CH3++Br+e-) CBr+ 1511632 (CBr++H2+H+e-) 187927 (CBr++3H+e-) CHBr+ 131468 (CHBr++H2+e-) 167763 (CHBr++2H+e-) CH2Br+ 108078 (CH2Br+ + H + e-) CH3Br+ 85031.2 (CH3Br+(3/2)+e-) 87617.2 (CH3Br+(1/2)+e-) Br+ 120137.8 (CH3 + Br++e-) - H+ ath http://www3.hi.is/~agust/rannsoknir/rempi/ch3br/PPT-210809aak.ppt; slide 2

Number of photons needed to reach thresholds for resonance excitation to 66037 cm-1 Rydberg / (3/2)5p;0 system: ion Lowest energy formation threshold: Second lowest Formation threshold: Third lowest formation threshold fourth lowest formation threshold fifth lowest formation threshold sixth lowest formation threshold C+ 5 (C++HBr+H2+e-) 5 (C++H+H2+Br-) 6 (C++H+H2+Br+e-) 6 (C++2H+HBr+e-) 6 (C++3H+Br-) 7 (C++3H+Br+e-) CH+ 4 (CH++H2+Br-) 5 (CH++H2+Br) 5 (CH++H+HBr+e-) 5 (CH++2H+Br-) 6 (CH++2H+Br+ +e-) CH2+ 4 (CH2+ + HBr) 4 (CH2+ + H + Br-) 5 (CH2++H+Br) CH3+ 3 (CH3++Br-) 4 (CH3++Br+e-) CBr+ 5 (CBr++H2+H+e-) 6 (CBr++3H+e-) CHBr+ 5 (CHBr++H2+e-) 6 (CHBr++2H+e-) CH2Br+ 4 (CH2Br+ + H + e-) CH3Br+ 3 (CH3Br+(3/2)+e-) 3 (CH3Br+(1/2)+e-) Br+ 4 (CH3 + Br++e-) - H+ ath http://www3.hi.is/~agust/rannsoknir/rempi/ch3br/PPT-210809aak.ppt; slide 11

resonance non-resonance [3/2]np;w [1/2]np;w [3/2]nd;w [1/2]nd;w 5 6 7 2 n = w = 4 n3 n2 n1 resonance non-resonance …………………………. ………….…………………………………………………… (1) (2) (3) (4) (5) (6) (7) (8) (9) (10)

I(M+)/I(CH3+) (M = Br, CBr) vs CH3+ REMPI spectrum I(79Br+)/I(CH3+) I(CH+)/I(CH3+) I(M+)/I(CH3+) (M = Br, CBr) vs CH3+ REMPI spectrum 2hn / cm-1 https://notendur.hi.is/~agust/rannsoknir/Crete16/PXP-180922.pxp ; Lay4, Gr11

CH3 Br* KERCH3 / eV KERBr / eV Range of detection on eV scale: Far out 2hv with CH3(X)+Br/Br* 3hv with CH3(X)+Br/Br* 1hv with CH3(X)+Br/Br* 3hv with CH3**+Br/Br* CH3 Far out 1.5 2.9 4.0 KERCH3 / eV 3hv** 1hv(x) 2hv(x) 3hv(x) Br* KERBr / eV 1.0 2.0 2.6 Dropbox….REMPI/From Arnar/CH3Br/Article_two_color/Petros_questions.pptx