Allene ν9and ν10: Low-Temperature Measurements of Line Intensity

• Published in: Journal of molecular spectroscopy Vol. 194; no. 2; pp. 256 - 268
• Main Authors: Wang, W.F., Sirota, J.M., Reuter, D.C.
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.04.1999
• ISSN: 0022-2852; 1096-083X
• DOI: 10.1006/jmsp.1999.7809

We report laboratory intensity measurements for the weak ν9(998.8 cm−1) and intense ν10(841.1 cm−1) bands of allene. Allene is predicted to be a constituent of Titan's atmosphere, and measurements of its abundance would yield important information about the atmospheric chemistry of that body. Spectra were obtained at a temperature of 200 K (approximating Titan conditions) using the high-resolution FTS instrument at Kitt-Peak National Observatory's McMath-Pierce observatory. A total of 505 ν9and 687 ν10line intensities were fit using a least-squares method to accurately determine two sets of transition dipole moments. Integrated band intensities computed utilizing the fitted parameters were found to be 36 ± 4% cm−2atm−1and 301 ± 4% cm−2atm−1for ν9and ν10, respectively, at 200 K.