1. CH3Br
Negative particle detections;
Electrons /PES:
KERs………………………………………………………………………………….. 2,4-9 images………………………………………………………………………………. 3,10-11
Normalized KERs………………………………………………………………
PES due to 1hv ion formation channels (predictions)…… & 22
PES due to 3hv ion formation channel (predictions)…… , 23 Effect of space charge (negligible)…………………………………. 5,9
Threshold due to Br- + hv -> Br + e-……………………………… 24
Updated

2. Negative particles pix Ry(2hv/cm-1): 68684(14.10.16) 67275(14.10.16))
66503( )
66019 ( )
pix
Gr:0, Lay:0

3. 66019 ( )
66503( )
67275( ))
68684( )

4. e- KERs eV Ry(2hv/cm-1): 68684(291.231 nm; 13.10.16)
Gr:1, Lay:1

5. e- KERs eV Ry(2hv/cm-1): 72973(274.114 nm; 14.10.16)
72973( nm; ) minimum space
charge effect
eV = 4.59e-5*(pix)2
eV = 3.181e-5*(pix)2 eV
Lay3;Gr3

6. e- KERs 5kV; eV = 4.58652 x 10-5 (pix)2 Off sets
To top
5kV; eV = x 10-5 (pix)2
Off sets
CH3+
+Br-
Ry(2hv/cm-1):
79610 ( nm; )
78339( nm; )
77165( nm; )
75905( nm; )
74249( nm; )
72973( nm; )
68684( nm; )
67275( nm; )
66503( nm; )
66019( nm; )
3kV; eV = x 10-5 (pix)2 eV
Gr:2, Lay:2

7. e- KERs
Ry(2hv/cm-1):
79610 ( nm; )
78339( nm; )
77165( nm; )
75905( nm; )
74249( nm; )
72973( nm; )
68684( nm; )
67275( nm; )
66503( nm; )
66019( nm; )
5kV; eV = x 10-5 (pix)2
3kV; eV = x 10-5 (pix)2 eV
Gr:2, Lay:2

8. e- KERs /PES spectra stacked as a function of two-photon excitation wavenumber:
To top
Ry(2hv/cm-1):
79610
78339
74249
72973
68684)
Energy scale
CH3+
+Br- eV
Gr:2, Lay:2

9. e- KERs /PES spectra stacked as a function of two-photon excitation wavenumber:
To top
Ry(2hv/cm-1):
79610
78339
74249
72973
68684)
Energy scale
CH3+
+Br- eV
Gr:2, Lay:2

10. Is this real or is this the edge of the detector?
To top
72973( nm; )
74249( nm; )
75905( nm; )
Is this real
or is this the edge
of the detector?
NB: Big „black holes“
we might be loosing
some low energy el
signals(?)
Gr:2, Lay:2

11. To top
77165( nm; )
78339( nm; )
79610 ( nm; )
Gr:2, Lay:2

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

16. 3Dhn eV CH3+ +Br- Ry(2hv/cm-1): 79610 (251.300 nm; 14.10.16)
Lay:0; Gr:15
sheet: Waves

17. * * 3Dhn eV CH3+ +Br- Ry(2hv/cm-1): 79610 (251.300 nm; 14.10.16)
Lay:0; Gr:15
sheet: Waves

18. Dhn eV CH3+ +Br- Ry(2hv/cm-1): 79610 (251.300 nm; 14.10.16)
Lay:1; Gr:13

19. Forming CH3 in ground state Then 3 hv photon ionization
PES for 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

20. Electron_KER_CH3_focus2.pxp : gr 15dE v1
CH stretch v2
OPLA
1359 v3 v4
Deformation
1370
1401.6
-31.6
77165
2 hv
(0,0,0,0)
cm-1 eV
(1,0,0,0)
(0,1,0,0)
(0,0,1,0)
(0,0,0,1)
(0,2,0,0)
(0,3,0,0)
(0,4,0,0)
(0,5,0,0)
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

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

22. Thresholds for CH3**(i) + 1hv -> CH3+ + e:
PES:
Thresholds for CH3**(i) + 1hv -> CH3+ + e:
CH3+
+Br-
Ry(2hv/cm-1):
79610 ( nm; )
78339( nm; )
77165( nm; )
75905( nm; )
74249( nm; )
72973( nm; )
68684( nm; )
67275( nm; )
66503( nm; )
66019( nm; ) eV
D(1hn)
sheet: Predictions-s
Lay:2; Gr:16

23. 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 ( nm; )
78339( nm; )
77165( nm; )
75905( nm; )
74249( nm; )
72973( nm; )
68684( nm; )
67275( nm; )
66503( nm; )
66019( nm; )
D(3hn) eV
sheet: Predictions-s
Lay:3; Gr:17
sheet: Waves

24. 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