Fourier Transform and Intracavity Laser Spectroscopy of NiCl System H: Identification of a [12.3] 2Σ+ State

✍ Scribed by L.C. O'Brien; K.M. Homann; T.L. Kellerman; James J. O'Brien

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 148 KB
• Volume: 211
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.2001.8484

✦ Synopsis

The (0,0) vibronic band of NiCl system H near 12 259 cm -1 was recorded at high resolution in absorption using intracavity laser spectroscopy (ILS) and in emission by Fourier transform (FT) spectroscopy. Though it was originally assigned in 1962 as the (1,1) vibronic band of 2 3/2 -X 2 5/2 , we have shown that this transition is the (0,0) vibronic band associated with a newly identified 2 + excited state and the X 2 3/2 ground state. The molecular constants for the new 2 + electronic state were derived from the rotational analysis. For the ILS absorption spectra, the NiCl molecules were produced in a nickel hollow cathode, operated with a small amount of CCl 4 . Line positions were referenced to iodine spectra observed from a heated extracavity cell using the intracavity laser as the light source. For the FT spectra, excited NiCl molecules were produced in a King-type carbon tube furnace.