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: