Improved infrared and visible emission spectra of the H3 and D3 molecules

✍ Scribed by M. Vervloet; James K.G. Watson

• Book ID: 104151727
• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 293 KB
• Volume: 217
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1016/s0022-2852(02)00053-x

✦ Synopsis

Better-resolved Rydberg-Rydberg emission spectra of the neutral H 3 and D 3 molecules in the infrared and visible regions, with less interference from H 2 and D 2 emission, have been obtained by using a Droege-Engelking type of corona discharge source. Using nl k notation, the lower electronic states are 3p 1 in the infrared and 2p 0 in the visible, and the upper electronic states are mixed ð3s; 3p 0 ; 3d 0 ; 3d 1 ; 3d 2 Þ states. In particular, a line near 16 842 cm À1 in H 3 , previously obscured by an H 2 line, reveals a ð3s; 3dÞ interaction that is confirmed by other lines. The spectra are analysed including this interaction. However, fits to effective Hamiltonians still have relatively large standard deviations, probably partly due to poor convergence of the rotational expansions and partly due to many small perturbations of the levels by background states.