Abstract
The isotope shift in the v 6 band of CH 3I has been measured with high resolution for the radioisotope 129I (half-life = 1.6 × 10 7 y) with respect to the stable 127I, using tunable diode laser spectroscopy. The average shift obtained from 30 transitions, free from interference in the RQ(J, 3) and RQ(J, 4) branches, amounted to (-0.0135 ± 0.0006) cm -1. The abundance ratio 129I/ 127I in the gas mixture was determined spectroscopically on RQ(16, 3) and found to be (0.032 ± 0.003), as compared to a mass-spectrometric analysis of (0.030 ± 0.001). The self and air broadening coefficients measured on RR(6, 0) of CH 3 127I were (32 ± 3) MHz Torr -1 and (10.4 ± 1.5) MHz Torr -1 respectively. The line strengths for RQ(16, 3) were found to be (2.0 ± 0.2) × 10 -21 cm -1 mol -1 cm 2 for both CH 3 127I and CH 3 129I.
Published Version
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