REMPI Spectra of Cl2: Vibrational and Rotational Analysis of the 21ΠgRydberg States of35Cl2,35Cl37Cl, and37Cl2

✍ Scribed by Gı́sli Hólmar Jóhannesson; Huasheng Wang; Ágúst Kvaran

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 240 KB
• Volume: 179
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1996.0212

✦ Synopsis

Rotational contours of the (2 / 1) resonance enhanced multiphoton ionization (REMPI) spectra of the vibrational bands corresponding to the 2 1 P g R X transitions in 35 Cl 2 , 35 Cl 37 Cl, and 37 Cl 2 for the natural abundance of isotopes have been recorded at room temperature. Vibrational bands consist of contributions from all three isotopomers with varying degrees of overlap depending on vibrational quantum numbers. Band heads and tails were analyzed by simulation calculation. Rotational constants (B £ and D £ ) and corresponding internuclear distances (r £ ) for the Rydberg state were obtained, as well as equilibrium position rotational parameters. Thus for 35 Cl 2 , B e Å 0.2763 { 0.0008 cm 01 , a e Å 0.0015 { 0.0001 cm 01 , and r e Å 1.868 { 0.005 A ˚. Vibrational analyses based on the determination of band origins from the spectral simulations were performed to obtain v e Å 664.8 { 0.2 cm 01 , v e x e Å 2.62 { 0.02 cm 01 for 35 Cl 2 , and T e Å 63970 { 3 cm 01 . Spectroscopic parameters for 35 Cl 37 Cl and 37 Cl 2 are derived from those for 35 Cl 2 in a standard way (see text).