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The Pure Rotational Spectrum of AuI

✍ Scribed by Linda M. Reynard; Corey J. Evans; Michael C.L. Gerry

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
148 KB
Volume
205
Category
Article
ISSN
0022-2852

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✦ Synopsis

The Fourier transform microwave (FTMW) spectra of gaseous monomeric AuF, AuCl, and AuBr have recently been reported (1, 2). Among other things, equilibrium geometries were evaluated, as well as several hyperfine parameters. The Au nuclear quadrupole coupling constants (NQCC) were found to show a marked variation from molecule to molecule, including a change of sign.

This note reports the spectrum of AuI, which has been measured in order to complete the series of the monomeric gold (I) halides. Apart from some ab initio calculations (3), there has been very little earlier work on this molecule. There are, however, reported Mo Β¨ssbauer (4), nuclear quadrupole resonance (NQR) (5), and vibrational (6) spectroscopic studies of solid AuI, which is a polymeric material.

The microwave spectrum of AuI was measured using Balle-Flygare-type (7) FTMW spectrometers, which have been described in detail elsewhere (8). These instruments each contain a cylindrical cavity with a spherical mirror (28 cm diameter, 38.4 cm radius of curvature) at each end. One of the mirrors may be moved in order to bring the cavity into resonance at the microwave excitation frequency. The fixed mirror holds the pulsed nozzle (General Valve, series 9) and the laser ablation system (9), which are used to prepare the sample and introduce it into the spectrometer cavity.

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