Absorption line profile measurement of rovibrational transition of acetylene molecule using a fiber comb spectrometer

Author

Yamada, K.M.T. ; Onae, A. ; Hong, F.-L. ; Inaba, H. ; Nakajima, Y. ; Matsumoto, H. ; Ito, F. ; Shimizu, T.

Author_Institution

Inst. for Environ. Manage. Technol. (EMTech), AIST, Tsukuba

fYear

2008

fDate

8-13 June 2008

Firstpage

140

Lastpage

141

Abstract

We have been developing a spectrometer to record an accurate absorption line profile of a rovibrational transition of acetylene in the 1.54 mum region using an extended cavity laser diode (ECLD) and a mode-locked fiber frequency comb. With the spectrometer, we have recorded the absorption line profiles for various pressures and have observed the collisional narrowing effect on the inhomogeneous Gaussian widths. Information of the Gaussian width which reflects the Maxwell-Boltzmann distribution can be used to estimate accurate temperature of the sample gas and also have possibility to provide a way to determine the Boltzmann constant.

Keywords

infrared spectra; organic compounds; rotational-vibrational states; spectral line intensity; statistical mechanics; Boltzmann constant; Gaussian widths; Maxwell-Boltzmann distribution; NIR spectra; absorption line profile measurement; acetylene molecule; collisional narrowing effect; extended cavity laser diode; fiber comb spectrometer; rovibrational transition; wavelength 1.54 mum; Absorption; Frequency; Gas lasers; Optical attenuators; Optical fiber polarization; Optical noise; Optical recording; Servomechanisms; Spectroscopy; Uncertainty;

fLanguage

English

Publisher

ieee

Conference_Titel

Precision Electromagnetic Measurements Digest, 2008. CPEM 2008. Conference on

Conference_Location

Broomfield, CO

Print_ISBN

978-1-4244-2399-6

Electronic_ISBN

978-1-4244-2400-9

Type

conf

DOI

10.1109/CPEM.2008.4574692

Filename

4574692