Fourier transform emission spectroscopy of the g4Δ–a4Δ system of FeCl

✍ Scribed by R.S. Ram; P.F. Bernath

• Book ID: 104151896
• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 164 KB
• Volume: 221
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1016/s0022-2852(03)00225-x

✦ Synopsis

The emission spectrum of FeCl has been investigated at high resolution in the near infrared. The molecule was excited in a microwave discharge lamp using a mixture of FeCl 3 vapor and 4.9 Torr of He, and the spectra were recorded in the 3000-12 200 cm À1 region using a Fourier transform spectrometer. New bands with R heads near 7725, 8149, 8577, 8949, 9319, 9686, and 10 050 cm À1 have been assigned as the 0-2, 0-1, 0-0, 1-0, 2-0, 3-0, and 4-0 bands (respectively) of a new 4 D-4 D system of FeCl. The strong bands of this system consist of four sub-bands assigned as 4 D 1=2 -4 D 1=2 , 4 D 3=2 -4 D 3=2 , 4 D 5=2 -4 D 5=2 , and 4 D 7=2 -4 D 7=2 . This transition is analogous to the 1 lm transitions of FeH and FeF. A rotational analysis of a number of bands in each sub-band has been obtained and spectroscopic constants extracted. The lower a 4 D state is affected by perturbations from a nearby electronic state, while the excited g 4 D state is free from perturbation. This work represents the first observation of a transition involving quartet states of FeCl.