Infrared spectra of the NeC₂D₄ and ArC₂D₄ complexes

详细信息    查看全文

• 作者：M. Rezaei ; K.H. Michaelian ; A.R.W. McKellar ; N. Moazzen-Ahmadi
• 关键词：Ethylene ; Argon ; Neon ; Infrared spectrum ; Dimer ; van der Waals ; Supersonic jet
• 刊名：Journal of Molecular Spectroscopy
• 出版年：2013
• 出版时间：July, 2013
• 年：2013
• 卷：289
• 期：Complete
• 页码：21-25
• 全文大小：406 K

文摘

Spectra of NeC₂D₄ and ArC₂D₄ are studied in the ¦Í₁₁ fundamental band region of C₂D₄ (¡Ö2200 cm^?1) using a tuneable quantum cascade laser to probe a pulsed supersonic slit jet expansion. The spectra are those of perpendicular bands of near-prolate asymmetric rotors, but with a doubling of transitions due to tunneling. These tunneling splittings are due to hindered internal rotation of C₂D₄ around its CC axis, and are more prominent for NeC₂D₄ than for ArC₂D₄. The analysis yields the first direct measurement of the A rotational constants for these complexes, and shows that the vibrational shifts are very small (<0.3 cm^?1). Attempts to observe the spectrum of HeC₂D₄ were not successful.