Download e-book for iPad: Berkeley Physics Course Tomo 2 - Electricidad y Magnetismo by Edward M. Purcell.

By Edward M. Purcell.

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CH 3 it decreases by - 0 . 4 5 to - 0 . 8 5 cm -1, with decreases for vsym. CH 3 progressing in the order C5H12 to C18H38. In addition, the vasym. 23 cm -1 and for vsym. CH2 is - 0 . 6 1 to - 0 . 0 4 cm -1. Again the vasym. CH2 mode increases in frequency and the vsym. CH2 mode decreases in frequency in going from solution in CC14 to solution in CDC13. Thus, both vasym. CH3 and vsym. CH2 increase in frequency and both vsym. CH3 and vsym. 5 wt. % solutions. These data confirm that the effects of these solvents are minor in these four molecular stretching vibrations.

Absorbance ratios and frequency separations are also presented for some vibrational bands. 2 lists IR vapor-phase frequencies and assignments for a variety of compounds containing C=C double bonds. Acrylonitrile and divinylsulfone exhibit vC=C at 1613 and 1620 cm -1, respectively. The allyl derivatives exhibit vC--C in the region 1641-1653cm -1. It is apparent that CN and SO2 groups joined to the vinyl group have the effect of lowering the C = C stretching frequency (3). The vasym. CH2=, vsym. CH2=, and CH2-- bending modes occur in the regions 3082-3122, 2995-3045, and 1389-1430 cm -1, respectively.

III. VAPORS A N D GASES Quality IR spectra can be recorded using partial pressures and appropriate cell lengths equipped, say, with potassium bromide windows. It should be noted that certain inorganic compounds react with KBr and form other inorganic salts on the surface of the KBr plate. Their reactions are readily detected because their reaction products can not be removed when the sample is evacuated under vacuum from the cell. The IR spectra of chemicals with low vapor pressure can be recorded using a variable long path length vapor cell either at ambient temperature or at elevated temperature.

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Berkeley Physics Course Tomo 2 - Electricidad y Magnetismo by Edward M. Purcell.


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