Cavity Ring Down Spectroscopy Measurements for High-Overtone Vibrational Bands of HC3N

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• 作者：St茅phane Douin ; Marcin Gronowski ; Nicolas Lamarre ; Viet-Tiep Phung ; S茅verine Boy茅-P茅ronne ; Claudine Cr茅pin ; Robert Ko艂os
• 刊名：Journal of Physical Chemistry A
• 出版年：2015
• 出版时间：September 10, 2015
• 年：2015
• 卷：119
• 期：36
• 页码：9494-9505
• 全文大小：652K
• ISSN：1520-5215

文摘

Overtone (5谓₁ and 6谓₁) and combination (4谓₁ + 谓₃ and 4谓₁ + 谓₂) vibrational bands of gaseous HC₃N, located in the visible range (14鈥?00鈥?5鈥?00 and 17鈥?00鈥?8鈥?00 cm^鈥?), were investigated by cavity ring-down absorption spectroscopy. The 5谓₁ + 谓₃ and 5谓₁ + 谓₂ combinations as well as the 6谓₁ + 谓₅ 鈥?谓₅ hot overtone band have also been identified, on the basis of previous overtone assignments. Absolute integrated intensity values and the ensuing oscillator strengths have been measured here for the first time; f values are typically confined between 4 脳 10^鈥?2 and 7 脳 10^鈥?1. For the even weaker 5谓₁ + 谓₂ combination band, the oscillator strength was estimated as 9 脳 10^鈥?3. The values concerning CH-stretch overtones (n谓₁) are similar to those found in the literature for HCN and C₂H₂, the molecules with sp-hybridized carbon atoms. Data presented here may prove useful for studying the photochemistry triggered with visible or near-IR radiation within the atmospheres of certain Solar System bodies, including Titan.