Pressure-Induced Frequency Lineshifts in the ν2Band of Ammonia: An Experimental Test of the Rydberg–Ritz Principle

✍ Scribed by M. Ibrahimi; A. Babay; B. Lemoine; F. Rohart

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 128 KB
• Volume: 193
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1998.7749

✦ Synopsis

Self-induced frequency lineshifts of NH 3 in the 2 band have been measured for low J and K values. By combination with lineshift parameters previously published for other frequency ranges, it is possible to consider several level manifolds connected by superabundant numbers of transitions. Using statistical tests, these results lead to a quite meaningful experimental confirmation of the nonadditivity of pressure lineshifts, that is, the Rydberg-Ritz combination principle cannot be extended to collisionally perturbed systems.