High-Resolution Rotational Spectroscopy of CH3I Using a Novel Doppler-Free Technique

✍ Scribed by S. Carocci; A. Di Lieto; A. Menciassi; P. Minguzzi; M. Tonelli

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 125 KB
• Volume: 175
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1996.0009

✦ Synopsis

A new experimental approach to double resonance spectroscopy is discussed in detail. The method uses collinear propagation of radiation of two frequencies to achieve velocity selection; it does not rely on nonlinear effects and it has a great sensitivity. Some examples of its application to the infrared-microwave region are described. By using a CO 2 laser and a mm-wave klystron we measured the frequency of rotational and vibrational transitions of CH 3 I with sub-Doppler resolution. We also obtained the first measurement of the electric dipole moment in the £ 6 Å 1 excited vibrational state and result is m 6 Å 1.6295(6) D.