High Resolution FTIR Spectroscopy of DCCCl: Anharmonic Resonances in the ν1 and ν2 Bands

✍ Scribed by DongBing Wang; Takashi Imajo; Keiichi Tanaka; Takehiko Tanaka; Hans Bürger

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 103 KB
• Volume: 207
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.2001.8317

✦ Synopsis

High-resolution infrared spectra of the ν 1 and ν 2 bands of DCCCl were observed using Bruker IFS 120HR Fourier transform spectrometers at resolutions of 0.0044 and 0.0035 cm -1 , respectively. For the DCC 35 Cl isotopomer, the ν 1 as well as the ν 2 band was found to be heavily perturbed. Detailed analyses revealed that the ν 1 state is in resonance with the l = 0 substate of the ν 3 + 4ν 4 state and that the ν 2 state is in resonance with the l = 0 substate of the ν 3 + 4ν 5 state. The rotational constants played a key role in identifying the perturbing states. In contrast, for the DCC 37 Cl isotopomer, the rotational structures of the ν 1 and ν 2 states are almost regular but slightly perturbed by interactions with the ν 3 + 4ν 4 and ν 3 + 4ν 5 states, respectively. The constants of resonances as well as the molecular constants for the ν 1 , ν 2 , ν 3 + 4ν 4 and ν 3 + 4ν 5 states were determined.