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http://dx.doi.org/10.1103/physrevb.39.10352 | DOI Listing |
The R branch of the nu(5)-nu(4) difference band of acetylene, 12C(2)H(2), is recommended as a calibration standard for the 100-200-cm(-1) region. The lines are split by l-type doubling into pairs with a 3:1 intensity ratio, but this can only be observed under high resolution. The position of the calculated maximum of each blended line contour is displaced by the l-type doubling from the accurately calculated wavenumber of the more intense component of each J pair, but not by more than one-fifteenth of the spectral slit width.
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