Laser spectroscopy of the b3Π–X1Σ transition of HfS

✍ Scribed by J.W.-H. Leung; W.S. Tam; Qin Ran; A.S.-C. Cheung

• Book ID: 104151694
• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 120 KB
• Volume: 217
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1016/s0022-2852(02)00019-x

✦ Synopsis

Using Fourier transform (FT) spectroscopy, Jonsson et al. [1] studied the electronic transitions of HfS in the near-infrared and visible regions, six band systems were observed and five singlet electronic states were identified and characterized. Microwave-induced emission spectrum of HfS was obtained by allowing a heated mixture of HfCl 4 and sulfur in to a tube excited by microwave discharge. In the study of the b 3 P-a 3 D transition by Launila et al. [2], two of the six singlet transitions identified by Jonsson et al. [1], namely A 1 R-X 1 R and B 1 P-X 1 R, were reassigned as the b 3 P 0þ -X 1 R and b 3 P 1 -X 1 R transitions. Molecular constants for both the b 3 P and X 1 R states were reported. However, due to limited resolution of the FT spectrometer, spectral lines of individual isotopic molecules have not been fully resolved. In this Note, we report an analysis of the highresolution laser-induced fluorescence (LIF) spectrum of the b 3 P-X 1 R transition with spectral lines of the 178 HfS and 180 HfS isotopic molecules resolved and molecular constants of these isotopes.

The near-infrared transition spectrum of HfS was recorded using a laser vaporization/reaction free jet expansion LIF spectrometer. A detailed description of the spectrometer and laser ablation system is available elsewhere [3,4]. HfS was produced by ablating a hafnium rod with laser pulses from a Nd:YAG laser (532 nm, 5-6 mJ) in the presence of CS 2 and Ar mixture. HfS molecules were excited by an argon ion pumped tunable Ti:sapphire laser. The spectral line width from our LIF spectrometer was about 250 MHz. The wavelength of the Ti:sapphire laser was measured by a wavemeter. High resolution spectra between 724 and 783 nm were recorded.