Frequency-comb-assisted precision laser spectroscopy of CHF3 around 8.6 µm.
J Chem Phys
; 143(23): 234202, 2015 Dec 21.
Article
en En
| MEDLINE
| ID: mdl-26696053
ABSTRACT
We report a high-precision spectroscopic study of room-temperature trifluoromethane around 8.6 µm, using a CW quantum cascade laser phase-locked to a mid-infrared optical frequency comb. This latter is generated by a nonlinear down-conversion process starting from a dual-branch Erfiber laser and is stabilized against a GPS-disciplined rubidium clock. By tuning the comb repetition frequency, several transitions falling in the υ5 vibrational band are recorded with a frequency resolution of 20 kHz. Due to the very dense spectra, a special multiple-line fitting code, involving a Voigt profile, is developed for data analysis. The combination of the adopted experimental approach and survey procedure leads to fractional accuracy levels in the determination of line center frequencies, down to 2 × 10(-10). Line intensity factors, pressure broadening, and shifting parameters are also provided.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Idioma:
En
Revista:
J Chem Phys
Año:
2015
Tipo del documento:
Article
País de afiliación:
Italia