The vibration-rotation of H₂O and its complexation with CO₂ in solid argon revisited

• Опубліковано в: : Физика низких температур
• Дата: 2003
• Автори: Michaut, Xavier, Vasserot, Anne-Marie, Abouaf-Marguin, Luce
• Формат: Стаття
• Мова: English
• Опубліковано: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2003
• Теми: Spectroscopy in Cryocrystals and Matrices
• Онлайн доступ: https://nasplib.isofts.kiev.ua/handle/123456789/128939
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: The vibration-rotation of H₂O and its complexation with CO₂ in solid argon revisited / Xavier Michaut, Anne-Marie Vasserot, Luce Abouaf-Marguin // Физика низких температур. — 2003. — Т. 29, № 9-10. — С. 1118-1124. — Бібліогр.: 27 назв. — англ.

Fourier-transform infrared spectroscopy in the frequency range 400–4000 cm–¹ has been used to investigate the absorption of H₂O and H₂O:CO₂ complex isolated in solid argon. Thanks to the lowest temperature reached in our experiment, temperature effects and nuclear spin conversion studies allow us to propose a new assignment of the rovibrational lines in the bending band n₂ for the quasi-freely rotating H₂O. An additional wide structure observed in this band shows two maxima around 1657.4 and 1661.3 cm–¹, with nuclear spin conversion of the high frequency part into the low frequency one. This structure is tentatively attributed to a rotation-ranslation coupling of the molecule in the cage. However, the equivalent effect is not observed in the vibrational stretching bands n₁ and n₃. Finally, by double doping experiments with CO₂, important new structures appear, leading us to unambiguously extract the frequencies of the lines of the H₂O:CO₂ complex.