Abstract A technique for measuring the vibration translational relaxation time of molecular gases using the spectrophone is described. The technique is based on the measurement of the phase of natural oscillations of the microphone membrane as a function of pressure of the gas under study. These oscillations manifest themselves in a shape of the optoacoustic (OA) signal at low gas pressure in the OA cell when the absorbing molecules are excited by short laser pulses. As an example the results on the relaxation time of the v1+3v3 state of H2O molecule in H2O-H2O and H2O-air collisions obtained using the OA cell of various sizes are presented.
Received: 09 August 1996
Revised: 17 February 1997
Accepted manuscript online:
PACS:
07.57.-c
(Infrared, submillimeter wave, microwave and radiowave instruments and equipment)
(Acoustooptical effects, optoacoustics, acoustical visualization, Acoustical microscopy, and acoustical holography)
Fund: Project supported by the Russian Fundamental Science Foundation.
Cite this article:
V.A.KAPITANOV, B.A.TIKHOMIROV, O.V.TIKHOMIROVA METHOD FOR THE STUDY OF FAST VIBRATIONAL RELAXATION OF MOLECULES USING SPECTROPHONE 1997 Acta Physica Sinica (Overseas Edition) 6 837
Nb5N6 microbolometer array for terahertz detection Tu Xue-Cou (涂学凑), Kang Lin (康琳), Liu Xin-Hua (刘新华), Mao Qing-Kai (毛庆凯), Wan Chao (万超), Chen Jian (陈健), Jin Biao-Bing (金飚兵), Ji Zheng-Ming (吉争鸣), Xu Wei-Wei (许伟伟), Wu Pei-Heng (吴培亨). Chin. Phys. B, 2013, 22(4): 040701.
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
