.png){kind=icon}
.png){kind=icon}
Return
Comb-locked cavity ring-down spectroscopy with variable temperature
.png){kind=icon}
OA
AI
DOI：10.1364/OE.376572.png)
.png){kind=icon}
Original request for help.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
Temperature dependence of molecular absorption line shape is important information for spectroscopic studies and applications. In this work, we report a comb-locked cavity ring-down spectrometer employing a cryogenic cooler to perform absorption spectroscopy measurements at temperatures between 40 K and 300 K. As a demonstration, we recorded the spectrum of the R(0) line in the (2-0) band of HD at 46 K. The temperature was also confirmed by the Doppler width of the HD line. Spectra of CH4 near 1.394 mu m were also recorded in a wide temperature range of 70 300 K. Lower-state energies of methane lines were analyzed by fitting these spectra, which can be directly compared with the HITRAN and TheoReTS databases. Considerable deviations were observed, indicating the need to investigate the assignments of the methane lines in this region. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Keywords:
INFRARED-ABSORPTION SPECTROSCOPY
LISTS 5852-7919 CM(-1)
HIGH-RESOLUTION
OVERTONE TRANSITION
JET EXPANSIONS
80 K
METHANE
COEFFICIENTS
SPECTRUM
BAND