The ground state infrared spectra of several isotopic forms of the CdH and ZnH radicals

• Published in: The Journal of chemical physics 1990, Vol.92 (1), p.14-21
• Main Authors: URBAN, R.-D, MAGG, U, BIRK, H, JONES, H
• Format: Article
• Language: English
• Subjects: 640302 - Atomic, Molecular & Chemical Physics- Atomic & Molecular Properties & Theory; ATOMIC AND MOLECULAR PHYSICS; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; CADMIUM 106; CADMIUM 108; CADMIUM 110; CADMIUM 111; CADMIUM 112; CADMIUM 113; CADMIUM 114; CADMIUM 116; CADMIUM COMPOUNDS; CADMIUM ISOTOPES; EVEN-EVEN NUCLEI; EVEN-ODD NUCLEI; Exact sciences and technology; FLUIDS; GASES; HYDRIDES; HYDROGEN COMPOUNDS; INFRARED SPECTRA; INTERMEDIATE MASS NUCLEI; INTERNAL CONVERSION RADIOISOTOPES; ISOMERIC TRANSITION ISOTOPES; ISOTOPE EFFECTS; ISOTOPES; MINUTES LIVING RADIOISOTOPES; Molecular properties and interactions with photons; Molecular spectra; NUCLEI; Physics; RADIOISOTOPES; SPECTRA; SPECTRAL SHIFT; STABLE ISOTOPES; YEARS LIVING RADIOISOTOPES; ZINC 64; ZINC 66; ZINC 67; ZINC 68; ZINC 70; ZINC COMPOUNDS; ZINC HYDRIDES; ZINC ISOTOPES
• ISSN: 0021-9606; 1089-7690
• DOI: 10.1063/1.458484

The infrared spectra of six isotopic forms of cadmium monohydride, [116CdH (7.6%), 114CdH (28.9%), 113CdH (12.3%), 112CdH (24.1%), 111CdH (12.7%), and 110CdH (12.4%)] and four isotopic forms of zinc hydride [68ZnH (18.6%), 67ZnH (4.1%), 66ZnH (27.8%), and 64ZnH (48.9%)] have been observed in natural abundance in their ground electronic state (2∑+) in the gas phase using a diode laser spectrometer. A number of transitions of 108CdH (0.9%) and 106CdH (1.2%) and 70ZnH (0.6%) were also observed, but too little data was accumulated to allow a good analysis. The hydrides were produced by reaction of hydrogen with metal vapor at elevated temperature in an electric discharge. The analysis of the experimental data was carried out in two ways. (a) A complete set of Dunham parameters and spin–rotation parameters (γ parameters) was determined for each isotopic species of the two radicals and (b) a set of mass-independent parameters were calculated for both ZnH and CdH. Since only information over the isotopic species of the heavy atom was produced in each case, effects arising from a breakdown of the Born–Oppenheimer approximation were negligible. The effects of the strong anharmonicity present in these two molecules on the values of the parameters are discussed.