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DMITRY S. SKVORTSOV, Chemistry Department, University of Southern California, Los Angeles, California 90089; HIROMICHI HOSHINA, Terahertz Sensing and Imaging Laboratory, RIKEN; 519-1399 Aramaki Aoba, Aoba-ku, Sendai, Miyagi, 980-0845, Japan; BORIS G. SARTAKOV, General Physics Institute, Vavilov str. 38, 117942 Moscow, Russia; AND ANDREY F. VILESOV, Chemistry Department, University of Southern California, Los Angeles, California 90089.
The effect of isotopic substitution on molecular rotations of CO2 and CH4 have been studied via infrared spectroscopy in helium droplets. In the spectral region of
1 +
3 (3500 - 3700 cm-1), rovibrational spectra of C18O2, C16O2 and C16O18O have been obtained showing significant participation of surrounding helium in rotations. In contrast, minor changes of rotational constants of CH4 and CD4 have been derived from the rovibrational spectra in the
3 region (3020 and 2260 cm-1 respectively). Rotational constants and band origins for all species have been determined. Coupling of molecular rotations with helium will be discussed.