microwave and raman spectra - °lo Transmission Wavenurnber...

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Unformatted text preview: °lo Transmission Wavenurnber (c m") Figure 3- Mw/far-infrared absorption spectrum of carbon monoxide, 12060. ' 21-! 198 Stokes Anti-Stokes CO 3 4B 4B. ’5- ‘90 em“ ’5 - so cm" '1‘}... 50 W3 25+ mo mm" Figure 6. Pure rotational Raman spectrum (simulated) for ‘ZC‘SO, using laser light of wavenumber v. - 30, 1 6’8 37.7 58 CO I Anti-Stokes 7\ =53ZJ nm Figure ?- Rotational Raman snéctrum for “two; using a laser at 532.1 nm. ' ' ‘ N Stokes ~ V I 560 460 360 I, - IOO Anti -Stokes l 200 3630 I 400 31.2 68 I , 500 /6’ 22 26 30 34 38 /0——'8 AE/sz 6 /0 H Figure 9. Antistokes band for several molecules showing effects of nuclear spin statistics. All have been scaled toa common B value, and . differential population effects due to the 2J+i degeneracies have mlbeen included. 34.! 68 Q flASor/Oflbn B fléo’or/a 2'75): fléo’or/O [7.071 B Figure 6. a) The fundamental absorption peak expected from the pure vibrational transition v=1+—o. b) Additional peaks due to "hot bands" (v=2<—1, 3<—2) and second and third harmonics (v=2«—0, 3-0). C) High resolution of the fundamental band (without the hot bands) showing wings due to rotational transitions. ,5“ P R l 5 :l' Wl .3 .5 l E ; i l l ' .9 l l a ; l . D I l < .i M.- 2600 y/cmrl ‘ 3100; Figure 7. The.hlgh-resolution spectrum of the fundamental (v=1<—O) vibrational transition'of HCl. (From B. P. Straughan, in Sgectroscogy, B. P. Straughan and S. Walker, eds., Wiley, N.Y., 1976, p. 178) 20A DIM”, (Key Iii-71.) Vi Brat-i Omar Yorktl-O‘AQJ Y T- . _ “ST-O K65 o atmhél V' brat tonal (Alf: 4-,) «Stakes dHZ'x‘-Jrolres “NIH.— JTa/Tes A (A V‘: o) (A tho) (AV: — i) r—Afi W S Q o r—‘Ax /a r-A‘fi l i l H4 5,.) H‘ ((5 63 ‘ 2J8 l~————»o———+—+—g__‘__, :2 Figure 8. Sketch showing the arrangement of lines in the Raman spectrum of a heteronuclear diatomic molecule. Pure rotational bands lie adjacent to the Rayleigh line, which is at the laser wavenumber. Q branches for vibrational bands lie 00 above and below maser. Each of these bands has rotational wings. Homonuclear diatomic molecule Raman spectra look similar, but show effects of nuclear spin statistics (intensity alternations or missing lines). ...
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This note was uploaded on 09/02/2008 for the course CHEM 452 taught by Professor Sergeia. during the Spring '08 term at Pennsylvania State University, University Park.

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microwave and raman spectra - °lo Transmission Wavenurnber...

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