CH3Br Negative particle detections; Electrons /PES:

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Presentation transcript:

CH3Br Negative particle detections; https://notendur.hi.is/~agust/rannsoknir/Crete16/PPT-161014-CH3Br(4).pptx Electrons /PES: KERs………………………………………………………………………………….. 2,4-9 images………………………………………………………………………………. 3,10-11 Normalized KERs………………………………………………………………. 12-18 PES due to 1hv ion formation channels (predictions)…….. 13-15 & 22 PES due to 3hv ion formation channel (predictions)…….. 16-17, 23 Effect of space charge (negligible)…………………………………. 5,9 Threshold due to Br- + hv -> Br + e-……………………………… 24 Updated 180813

Negative particles pix Ry(2hv/cm-1): 68684(14.10.16) 67275(14.10.16)) 66503(14.10.16) 66019 (14.10.16) pix https://notendur.hi.is/~agust/rannsoknir/Crete16/PXP-161014.pxp; Gr:0, Lay:0

66019 (14.10.16) 66503(14.10.16) 67275(14.10.16)) 68684(14.10.16)

e- KERs eV Ry(2hv/cm-1): 68684(291.231 nm; 13.10.16) https://notendur.hi.is/~agust/rannsoknir/Crete16/PXP-161014.pxp; Gr:1, Lay:1

e- KERs eV Ry(2hv/cm-1): 72973(274.114 nm; 14.10.16) 72973(274.114 nm; 26.10.17) minimum space charge effect eV = 4.59e-5*(pix)2 eV = 3.181e-5*(pix)2 eV https://notendur.hi.is/~agust/rannsoknir/Crete16/PXP-161014.pxp; Lay3;Gr3

e- KERs 5kV; eV = 4.58652 x 10-5 (pix)2 Off sets To top 5kV; eV = 4.58652 x 10-5 (pix)2 Off sets CH3+ +Br- Ry(2hv/cm-1): 79610 (251.300 nm; 14.10.16) 78339(255.300 nm; 14.10.16) 77165(259.232 nm; 14.10.16) 75905(263.527 nm; 14.10.16) 74249(269.394 nm; 14.10.16) 72973(274.114 nm; 14.10.16) 68684(291.231 nm; 13.10.16) 67275(297.324 nm; 13.10.16) 66503(300.813 nm; 13.10.16) 66019(303.000 nm; 13.10.16) 3kV; eV = 2.95432 x 10-5 (pix)2 eV https://notendur.hi.is/~agust/rannsoknir/Crete16/PXP-161014.pxp; Gr:2, Lay:2

e- KERs Ry(2hv/cm-1): 79610 (251.300 nm; 14.10.16) 78339(255.300 nm; 14.10.16) 77165(259.232 nm; 14.10.16) 75905(263.527 nm; 14.10.16) 74249(269.394 nm; 14.10.16) 72973(274.114 nm; 14.10.16) 68684(291.231 nm; 13.10.16) 67275(297.324 nm; 13.10.16) 66503(300.813 nm; 13.10.16) 66019(303.000 nm; 13.10.16) 5kV; eV = 4.58652 x 10-5 (pix)2 3kV; eV = 2.95432 x 10-5 (pix)2 eV https://notendur.hi.is/~agust/rannsoknir/Crete16/PXP-161014.pxp; Gr:2, Lay:2

e- KERs /PES spectra stacked as a function of two-photon excitation wavenumber: To top Ry(2hv/cm-1): 79610 78339 77165 75905 74249 72973 68684) 67275 66503 66019 Energy scale CH3+ +Br- eV https://notendur.hi.is/~agust/rannsoknir/Crete16/PXP-161014.pxp; Gr:2, Lay:2

e- KERs /PES spectra stacked as a function of two-photon excitation wavenumber: To top Ry(2hv/cm-1): 79610 78339 77165 75905 74249 72973 68684) 67275 66503 66019 26.10.17 Energy scale 14.10.16 CH3+ +Br- eV https://notendur.hi.is/~agust/rannsoknir/Crete16/PXP-161014.pxp; Gr:2, Lay:2

Is this real or is this the edge of the detector? To top 72973(274.114 nm; 14.10.16) 74249(269.394 nm; 14.10.16) 75905(263.527 nm; 14.10.16) Is this real or is this the edge of the detector? NB: Big „black holes“ we might be loosing some low energy el signals(?) https://notendur.hi.is/~agust/rannsoknir/Crete16/PXP-161014.pxp; Gr:2, Lay:2

To top 77165(259.232 nm; 14.10.16) 78339(255.300 nm; 14.10.16) 79610 (251.300 nm; 14.10.16) https://notendur.hi.is/~agust/rannsoknir/Crete16/PXP-161014.pxp; Gr:2, Lay:2

PES spectra normalized to threshold energies (x-axis) on a DE scale for DE = 0 for the 66019 cm-1 2hv Rydberg excitation for 1hv excitation:

3Dhn eV CH3+ +Br- Ry(2hv/cm-1): 79610 (251.300 nm; 14.10.16) https://notendur.hi.is/~agust/rannsoknir/Crete16/Electron_KER_CH3_focus-170727.pxp; Lay:0; Gr:15 https://notendur.hi.is/~agust/rannsoknir/Crete16/XLS-160912.xlsx sheet: Waves

* * 3Dhn eV CH3+ +Br- Ry(2hv/cm-1): 79610 (251.300 nm; 14.10.16) https://notendur.hi.is/~agust/rannsoknir/Crete16/Electron_KER_CH3_focus-170727.pxp; Lay:0; Gr:15 https://notendur.hi.is/~agust/rannsoknir/Crete16/XLS-160912.xlsx sheet: Waves

Dhn eV CH3+ +Br- Ry(2hv/cm-1): 79610 (251.300 nm; 14.10.16) https://notendur.hi.is/~agust/rannsoknir/Crete16/Electron_KER_CH3_focus-170727.pxp; Lay:1; Gr:13

Forming CH3 in ground state Then 3 hv photon ionization PES for 77165 cm-1 Red lines indicate 3 hv transitions between vibrational states of the CH3 fragment Forming CH3 in ground state Then 3 hv photon ionization Electron_KER_CH3_focus2.pxp : gr 15; From: Dropbox/REMPI/From Arnar/CH3Br/Crete 2016/Revisit_77165_CH3_and_PES.pptx; slide 2

Electron_KER_CH3_focus2.pxp : gr 15 dE v1 CH stretch 3004.43 -3004.43 v2 OPLA 1359 606.453 752.547 v3 3108.38 3160.821 -52.441 v4 Deformation 1370 1401.6 -31.6 77165 2 hv (0,0,0,0) 36381.5 cm-1 4.510787 eV (1,0,0,0) 39385.93 4.883294 (0,1,0,0) 35628.95 4.417482 (0,0,1,0) 36433.94 4.517289 (0,0,0,1) 36413.1 4.514705 (0,2,0,0) 34876.41 4.324177 (0,3,0,0) 34123.86 4.230872 (0,4,0,0) 33371.31 4.137567 (0,5,0,0) 32618.77 4.044262 CH3 (0,0,1,0) + 3hn -> CH3+(0,0,1,0) + e- (CH str.) CH3 (0,0,0,1) + 3hn -> CH3+(0,0,0,1) + e- (def.) CH3 (0,0,0,0) + 3hn -> CH3+(0,0,0,0) + e- (n0) CH3 (0,5,0,0) + 3hn -> CH3+(0,5,0,0) + e-; OPLA CH3 (0,4,0,0) + 3hn -> CH3+(0,4,0,0) + e-; OPLA CH3 (0,3,0,0) + 3hn -> CH3+(0,3,0,0) + e-; OPLA CH3 (0,2,0,0) + 3hn -> CH3+(0,2,0,0) + e-; OPLA CH3 (0,1,0,0) + 3hn -> CH3+(0,1,0,0) + e-; OPLA CH3 (1,0,0,0) + 3hn -> CH3+(0,0,0,0) + e- Electron_KER_CH3_focus2.pxp : gr 15 From: Dropbox/REMPI/From Arnar/CH3Br/Crete 2016/Revisit_77165_CH3_and_PES.pptx; slide 3

D(nhv) comparison D(1hv) D(3hv)

Thresholds for CH3**(i) + 1hv -> CH3+ + e: PES: Thresholds for CH3**(i) + 1hv -> CH3+ + e: CH3+ +Br- Ry(2hv/cm-1): 79610 (251.300 nm; 14.10.16) 78339(255.300 nm; 14.10.16) 77165(259.232 nm; 14.10.16) 75905(263.527 nm; 14.10.16) 74249(269.394 nm; 14.10.16) 72973(274.114 nm; 14.10.16) 68684(291.231 nm; 13.10.16) 67275(297.324 nm; 13.10.16) 66503(300.813 nm; 13.10.16) 66019(303.000 nm; 13.10.16) eV D(1hn) https://notendur.hi.is/~agust/rannsoknir/Crete16/XLS-171001-CH3Br.xlsx; sheet: Predictions-s https://notendur.hi.is/~agust/rannsoknir/Crete16/Electron_KER_CH3_focus-170727.pxp; Lay:2; Gr:16

CH3I(X) + 3hv -> CH3I(3/2,1/2)+ + e PES: Thresholds for CH3I(X) + 3hv -> CH3I(3/2,1/2)+ + e PES: CH3+ +Br- No clear common peaks Corresponding to the channels CH3I(X) + 3hv -> CH3I(3/2,1/2)+ + e Ry(2hv/cm-1): 79610 (251.300 nm; 14.10.16) 78339(255.300 nm; 14.10.16) 77165(259.232 nm; 14.10.16) 75905(263.527 nm; 14.10.16) 74249(269.394 nm; 14.10.16) 72973(274.114 nm; 14.10.16) 68684(291.231 nm; 13.10.16) 67275(297.324 nm; 13.10.16) 66503(300.813 nm; 13.10.16) 66019(303.000 nm; 13.10.16) D(3hn) eV https://notendur.hi.is/~agust/rannsoknir/Crete16/XLS-171001-CH3Br.xlsx; sheet: Predictions-s https://notendur.hi.is/~agust/rannsoknir/Crete16/Electron_KER_CH3_focus-170727.pxp; Lay:3; Gr:17 https://notendur.hi.is/~agust/rannsoknir/Crete16/XLS-160912.xlsx sheet: Waves

PES D = E(1hv) - Eea 𝐵𝑟 − →𝐵𝑟+ 𝑒 − 10 9 8 7 6 5 4 3 2 1 𝐵𝑟 − →𝐵𝑟+ 𝑒 − 10 D = E(1hv) - Eea 9 8 7 6 5 4 3 2 1 \Dropbox\...\Arnar\CH3Br\Crete 2016\Electron_KER_new_eV_scale.pxp