1. 2 color VMI exp. CH3(X;v1v2v3v4) detection; https://notendur. hi
Content: pages:
KERs for Ry(72977; nm), CH3(211) detection…………………. ……………….. 2,4-6 possible procedures………………………………………………………………….. ……………….. 3
CH3Br absorption spectra and possible probe absorption…………………………
Image and KER for Ry(72977; nm), CH3(000) detection…. ………………
Comparison with Theos work from 2009………………………………….. …………………
Vibrational frequencies: CH3´s and CH3Br´s…………………………………………………
CH3 2 color KERS and possible explanation……………………………….. ………………… vibrational structure………………………………… ……………………………………………………. 29 comparison of peaks due to 1hv excitation and CH3(X) + Br/Br* formation…….. 30
Udated: (slide 30)

2. Could these be due to CH3+ formed via CH3Br + 1hv and/or 2hv(274.14)
KERs (xx) / CH3(211; nm) detect.:
i.e.:
CH3**(3p,2A2;0100)
CH3 (X ;0100)
2-color; Both lasers
Ry(2hv/cm-1):
72977/ nm
( )
Pump (Dye laser; nm; 72977(Ry))
Probe (MOPO; nm; CH3(211)
Could these be due to CH3+ formed
via CH3Br + 1hv and/or 2hv(274.14)
-> CH3 + Br*/Br ? eV
Waves. 
Gr:1, Lay:0

3. i.e. : according to the 2 color processes:
To top
i.e. : according to the 2 color processes:
Two color CH3 detection: c)
CH3+ + Br/Br*
CH3+ + Br/(Br*) c)
3hv
CH3* + Br/(Br*)
pump
CH3 **(3p2A2)+ Br/Br* b)
Ry(p)
Ry(s)?
KERs
2hv
a-b)
probe
2hv a)
KERs
1hv
CH3 + Br*
1hv
CH3 + Br
See also slide 41

4. 2-color; Both lasers
Ry(72977; nm); CH3(211; nm) detect.:
? Do not understand
From Pavle,

5. Pump (Dye laser; 274.14 nm; 72977(Ry))
From Pavle,

6. Probe (MOPO; nm; CH3(211)
From Pavle,

7. Absorption spectra for CH3Br 103 – 207nm (~48400 – 96800 cm-1)
; Gr:2

8. 2hv energy for probe laser for (329.5nm)CH3(X) - - - -
5s : [3/2]5s
5s’ : [1/2]5s
5s’ 5s
cm-1
2hv energy for probe laser for (329.5nm)CH3(X)
1 hv absorption spectra Locht et.al (see link)
; Gr:2

9. Close up of region where 2 hv probe laser reaches.
Close up of region where 2 hv probe laser reaches.
Definitely some absorbance in this region for CH3Br n2 n3
cm-1
Causley and Russel (1974)
; Gr:2

10. Pavlé; : : Initially we wanted to record ground state CH3 through 000 vibronic transition at
around nm, but the power of the laser at was a bit low. We recorded
only one image and decided to leave this for later. You can see the image in the first
attachment, it shows some rings. :
Ry(72977; nm)
2-color exp.
CH3 (000)
detection
NB: Worth getting a KER!

11. 2-color; Both lasers;
Ry(72977; nm); CH3(000; nm) detect.:
i.e.:
CH3**(3p,2A2;0000)
CH3 (X ;0000)
From Pavle, ,

12. Ours CH3Br+**(B2E) CH3 + Br+ CH3Br+**(A2A1) Our Scanning range
V. Blanchet et al. 2009
Theo et al., 2009 left arrow: 1hv = cm-1; right arrow: cm-1
CH3Br+**(B2E) #
CH3 + Br+ #
CH3Br+**(A2A1) #
Our
Scanning
range
Ours #
“Energetics”
Gr:0; Lay:0

13. 2hv for probe = 329.5 nm (CH3,211detection) Standard Region scanned by
Absorption
spectrum
Region scanned by
Theo, 2009 *:
cm-1 *
“various things”
; Gr:2, Lay:0

14. Max thresholds for our data as indicated
CH3;
KERs /,pump = ; probe = nm (CH3,211detection)
and comparison with Theos work from 2016:
Max thresholds for our data as indicated #
2 colors
CH3Br+(E1/2) + 1hv CH3++Br/Br*
Ry(2hv/cm-1):
72977/274.14
pump ( )
probe
pump
probe
pump
CH3Br+(E3/2) + 1hv CH3++Br/Br* Br
probe
pump
CH3Br + 1hv CH3+Br/Br*
Br*
cm-1
333.6 nm
Theo et al., 2009; One-color CH3+ KERS,
cm-1
334.0 nm
Probe (MOPO)
KER(CH3) / eV* #
; sheet: “60698 “(for thresholds)
Lay:0; Gr:1
sheet: Predictions-s
*f= 2.98x10-5

15. Interpretations of spectral features:#
KER(CH3) / eV*
# Most probably he is accidentally on resonance for CH3(X) 000 and detecting CH3(X,0000) formed by 1hv + CH3Br -> CH3(X,0000) + Br (180810)
*f= 2.98x10-5
Theo et al., 2009; One-color CH3+ KERS,
Lay:0; Gr:1

16. https://notendur. hi. is/~agust/rannsoknir/papers/pccp11-2234-09
Theo et al., 2009; One-color CH3+ KERS,
;Gr:0 (left); Gr:13 (right)

17. OPLAs:
CH3+
CH3**3p2A2
CH3(X)
NIST

18. CH3Br+(X)
CH3Br(X)
NIST

19. 1 2 2 Pump (dye l.): 255.317 nm/ 78334 cm-1/(9a) 1 1 eV 2 1 2 1 eV
Probe(mopo): nm
Probe(mopo): nm 1 1 1 eV
Probe(mopo): nm
Probe(mopo): nm 2 1 2 2 2 1 eV
; Lay0, Gr:1,4,5,3

20. 2 1 1 eV Pump (dye l.): 274.14 nm/ 72977 cm-1/(5):
Probe(mopo): nm
Probe(mopo): nm 1 2 1 eV
Ry(2hv/cm-1):
72977/274.14
pump ( )
Ry(2hv/cm-1):
79620/251.24
pump ( )
Sheet: Waves. 
; Lay1, Gr:7
; Lay2, Gr:2

21. 1 2 2 Region scanned by Theo, 2009 *: 2hv for probeing of CH3(X): 5s’2 1 2
Standard
Absorption
spectrum n3 n2
cm-1 *
Sheets: “various things” & “Waves”
; Gr:2, Lay:0

22. Two color CH3 detection:
Explanation idea(?) :
To top
Two color CH3 detection:
CH3+ +
Br/Br*
CH3++Br/(Br*)
CH3+ + Br/Br*
3hvr,pd
CH3Br+
(X,3/2,1/2)
CH3 **+ Br/Br*
Ry(p)
CH3 **(3p2A2)+ Br/Br*
pump
Ry(s)
Probe CH3(X;v1v2v3v4)
probe i v´
v´´
transitions
1hvpd
KERs
1hv
CH3 + Br*
(no. 5)
(10)
CH3 + Br
(9)
See also slide 41

23. cm-1 r/A CH3+ CH3+ CH3+ + Br/Br* CH3+ CH3+ + Pump(no 9; 2hv=78370)
Excitation and energetic scheme for
2 color MPI, in scale /
alternative idea 2:
CH3+
CH3+
CH3+
+ Br/Br*
CH3+
CH3+
CH3+ +
Br/Br*
cm-1
CH3Br+
(X,3/2,1/2)
CH3 **(3p2A2)+ Br/Br*
Pump(no 9; 2hv=78370)
Probe
CH3(211)
2hv=
60698
KERs
1hv
CH3 + Br*
CH3 + Br
r/A
; Lay0, Gr0

24. comparison of KERs on a (1hv)*f(CH3) scale E(Br*)-E(Br) D(1hv)*f(CH3)
CH3(X;v1v2v3v4)
+ Br*
CH3(X;v1v2v3v4)
+ Br
Z component
D(1hv)*f(CH3)
; Lay3, Gr:8

25. After „cleaning“ of spikes by Pavle (send by messanger 171129):
„Normalized“ preferred
agust,heima,….rannsóknir/Crete/Crete-17/CH3Br/….

26. Messenger, wed (171129):
So, finally I have sent you the Origin graphs
5 origin files, because the sixth one (dissociation at 274 nm and probing of CH3(211) was okay
And the Excel file, with the summary of the experiments
just a second, I noticed that I sent you an older version of
CH3Br_ DIV2_CH3_000
I have just sent you another , with the correct KER of CH3(000) at nm
Files were transfered to agust,heima,..rannsoknir/Crete/Crete-17/CH3Br/CH3-two-color/…

27. comparison of KERs on a (1hv)*f(CH3) scale; E(Br*)-E(Br)
cleaned spectra
E(Br*)-E(Br)
CH3(X;v1v2v3v4)
+ Br*
CH3(X;v1v2v3v4)
+ Br
Z component
D(1hv)*f(CH3) / eV
; Lay4, Gr:9

28. Spacing between „sharp“ peaks in the KERs is close to E(Br*)-E(Br)
Reasonably good fit for Ry peak no. 10 (000 probing) vs. both „sharp“ peaks
Relative intensity of the „sharp“ non-resonance paeks vs. broad feature peaking at low KER increases as (5) < (9) <(10) as to be expected.
Measures peaks tend to appear at higher KER values than predicted (analogous is found for Br+ two color „sharp“peak) (Is the pixel factor 2.98e-5) too high).

29. NO, wrong interpretation (entry: 180816)
From pavle/messenger

30. CH3 KERs:
One color (old), 2hv = cm-1 a) One color (new), 2hv = cm-1 a)
Two-color (pump + probe(000 detection)); 2hv = cm-1 2hv = cm-1
One-color (old), 2hv = cm-1
Different conditions,
Possibly(?): new colder than old
*f= 2.98x10-5