High-Resolution, Rotationally Resolved Electronic Spectroscopy of the MgNC Radical

✍ Scribed by Rossana R. Wright; Terry A. Miller

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 154 KB
• Volume: 194
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1998.7788

✦ Synopsis

High-resolution, rotationally resolved, laser-induced fluorescence (LIF) spectra for the origin band, as well as several transitions involving vibrationally excited levels of the A ˜2⌸ 4 X ˜2⌺ ϩ electronic transition of the MgNC radical, have been recorded using the output of a pulse-amplified Ti:Sapphire ring laser. The MgNC radical was generated in a supersonic free jet expansion by simultaneous laser ablation of a magnesium rod and photolysis of acetonitrile (CH 3 CN). Rotational analysis yielded molecular constants for both the ground and excited states of the studied vibronic transitions. The molecular constants for the vibrationless state of the X ˜state are in excellent agreement with previous microwave studies of MgNC. Since the A ẽlectronic state of MgNC is a linear 2 ⌸ state, the bending vibronic level structure is subject to both Renner-Teller and spin-orbit coupling. Suggested vibronic assignments of the observed transitions, made considering both these interactions and with the aid of the rotational analysis, are discussed.