$CO_{2}$ LASER PHOTOACOUSTIC SPECTROSCOPY OF SOME HAZARDOUS MOLECULES
Loading...
Date
2002
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
Laser photoacoustic spectra of RDX, TNT, heroin, morphine and narcotine in the powder form and of methanol, ethanol and trichloroethylene in the varpor phase have been recorded in the 9.6 and $10.6 \mu$ m regions using a rotational line tunable $CO_{2}$ Iser. The persistent vibrational bands in RDX are observed at $1045, 941 cm^{-1}$ and those in TNT are at $978, 946 cm^{-1}$. The characterstic bands in heroin are at $976, 944 cm^{-1}$, in morphine at $973, 949 cm^{-1}$ and in the narcotine at 1043, 936 and $929 cm^{-1}$. Assignments of the vibrational bands in terms of normal modes have been made with the help of ab initio calculations of molecular geometries and the intramolecular force constants. In the case of vapor phase spectra, the rotational contours with two prominent peaks in methanol and ethanol are observed in the $9.6 \mu$ m region whereas trichloroethylene exhibits three peaks in its rotational contour in the $10.6 \mu$ m region.
Description
Author Institution: Department of Physics, Banaras Hindu University; Department of Physics, Banaras Hindu University; Department of Physics, Burdwan University