CH3Br, 201009
(2+n)REMPI spectra assignments for region 66000 – 70000 cm-1
agust, heima,...Sept09/CH3Br-Overall-021009km-201009ak.pxpagust,www,...Sept09/PPT-201009ak.ppt
See next slide
Causley and Russel,JCP, 62(3), p:848, (1975):
Causley and Russel,JCP, 62(3), p:848, (1975):
cm-1
20
15
10
5
0
x103
152150148146144[cm
-1]
[3/2
]5p;
0
[1/2
]5p;
0
agust, heima,...Sept09/CH3Br-Overall-021009km-201009ak.pxp
68877.6 67273 665026602068661
nm
20
15
10
5
0
x103
152150148146144[cm
-1]
[3/2
]5p
;0
[1/2
]5p
;0
nm
http://webbook.nist.gov/cgi/cbook.cgi?ID=C74839&Units=SI&Mask=800:
i.e. The bands 66502,67273 and 68877.6 cm-1 are[3/2]5p;0, i <-<- Ground state; i = 3,2,1 – transitions,
i.e. Correspond to transition to vibrationally excited states
Causley & Russel / cm-1
Ours / cm-1 Ours-Causley´s/ cm-1
transition Vibr. Wave-
numbers[3/2]5p;0
Vibr. Wave-
numbersground state
66004 66020 16 Y(origin)
66482 66502 20 Y + 3´ 3´= 482 3´´= 611
67246 67273 27 Y + 2´ 2´= 1253 2´´= 1306
68846 68877.6 31.6 Y + 1´ 1´= 2857.6 1´´= 2935
68659 68661 2 Y’ (origin)
CH3Br
Y
Y´
(0,0,0,...)
(0,0,0,...)
(0,0,1,...)
(0,1,0,...)
(1,0,0,...)(0,0,0,...)
3/2::
1/2:::
(v1´,v2´,v3´,...)
(v1´´,v2´´,v3´´,...)=
CH3Br*
66020
66502
67273
68877.668661
(3/2)5p;0
(1/2)5p;0
Causley & Russel / cm-1
Ours / cm-1 Ours-Causley´s/ cm-1
transition Vibr. Wave-
numbers[3/2]5p;0
Vibr. Wave-
numbers[1/2]5p;0
66004 66020 16 Y(origin)
66482 66502 20 Y + 3´ 3´= 482 Y’ + 3´´= 69143
67246 67273 27 Y + 2´ 2´= 1253 Y’ + 2´´= 69914
68846 68877.6 31.6 Y + 1´ 1´= 2857.6 Y’ + 1´´= 71518.6
68659 68661 2 Y’ (origin)
Prediktions for Y´+ i´; i = 1,2,3 spectra: