Low Temperature Broadening Coefficients in the n2 Band of Chloromethane

Résultats de recherche: Contribution à un événement scientifique (non publié)Poster

Résumé

The methyl chloride has, in the later years, taken a special place in atmospheric studies. Following the decrease of CFC-gazes production, it became
one of the main source of chlorine ions in our atmosphere. As such it plays a
major role in the ozone depletion. Its origin is multiple: biomass burnings,
tropical forests and human industry. An extensive study of methyl chloride
is mandatory to be able to monitor ozone depletion and atmospheric activity.
In this work, we studied the N2-broadening coefficients in the QR(J,3)
sub-branch of the n2 band of chloromethane. We focused ourselves on low
temperatures, from 200 K to room temperature. The spectra were recorded
with a high resolution tunable diode laser spectrometer. For each line, at
each temperature, we measured the collisional half-width with four different
nitrogen pressures, ranging from 12 to 35 mbar.
We retrieved the collisional N2-broadening coeffiients by fitting on the experimental lineshape the Voigt profile and the Rautian and Galatry models,
which take into account the Dicke narrowing effect. We then analyzed the
temperature and the J dependences of the collisional broadening coefficient.
Finally, we compared our results with previous studies.
langue originaleAnglais
étatPublié - 24 août 2015

Empreinte digitale

ozone depletion
methyl chloride
chlorofluorocarbons
laser spectrometers
biomass burning
coefficients
chlorine
industries
diodes
atmospheres
high resolution
room temperature
profiles
ions
temperature

Citer ceci

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title = "Low Temperature Broadening Coefficients in the n2 Band of Chloromethane",
abstract = "The methyl chloride has, in the later years, taken a special place in atmospheric studies. Following the decrease of CFC-gazes production, it becameone of the main source of chlorine ions in our atmosphere. As such it plays amajor role in the ozone depletion. Its origin is multiple: biomass burnings,tropical forests and human industry. An extensive study of methyl chlorideis mandatory to be able to monitor ozone depletion and atmospheric activity.In this work, we studied the N2-broadening coefficients in the QR(J,3)sub-branch of the n2 band of chloromethane. We focused ourselves on lowtemperatures, from 200 K to room temperature. The spectra were recordedwith a high resolution tunable diode laser spectrometer. For each line, ateach temperature, we measured the collisional half-width with four differentnitrogen pressures, ranging from 12 to 35 mbar.We retrieved the collisional N2-broadening coeffiients by fitting on the experimental lineshape the Voigt profile and the Rautian and Galatry models,which take into account the Dicke narrowing effect. We then analyzed thetemperature and the J dependences of the collisional broadening coefficient.Finally, we compared our results with previous studies.",
author = "Sylvain Leonis and Muriel Lepere",
year = "2015",
month = "8",
day = "24",
language = "English",

}

Low Temperature Broadening Coefficients in the n2 Band of Chloromethane. / Leonis, Sylvain; Lepere, Muriel.

2015.

Résultats de recherche: Contribution à un événement scientifique (non publié)Poster

TY - CONF

T1 - Low Temperature Broadening Coefficients in the n2 Band of Chloromethane

AU - Leonis, Sylvain

AU - Lepere, Muriel

PY - 2015/8/24

Y1 - 2015/8/24

N2 - The methyl chloride has, in the later years, taken a special place in atmospheric studies. Following the decrease of CFC-gazes production, it becameone of the main source of chlorine ions in our atmosphere. As such it plays amajor role in the ozone depletion. Its origin is multiple: biomass burnings,tropical forests and human industry. An extensive study of methyl chlorideis mandatory to be able to monitor ozone depletion and atmospheric activity.In this work, we studied the N2-broadening coefficients in the QR(J,3)sub-branch of the n2 band of chloromethane. We focused ourselves on lowtemperatures, from 200 K to room temperature. The spectra were recordedwith a high resolution tunable diode laser spectrometer. For each line, ateach temperature, we measured the collisional half-width with four differentnitrogen pressures, ranging from 12 to 35 mbar.We retrieved the collisional N2-broadening coeffiients by fitting on the experimental lineshape the Voigt profile and the Rautian and Galatry models,which take into account the Dicke narrowing effect. We then analyzed thetemperature and the J dependences of the collisional broadening coefficient.Finally, we compared our results with previous studies.

AB - The methyl chloride has, in the later years, taken a special place in atmospheric studies. Following the decrease of CFC-gazes production, it becameone of the main source of chlorine ions in our atmosphere. As such it plays amajor role in the ozone depletion. Its origin is multiple: biomass burnings,tropical forests and human industry. An extensive study of methyl chlorideis mandatory to be able to monitor ozone depletion and atmospheric activity.In this work, we studied the N2-broadening coefficients in the QR(J,3)sub-branch of the n2 band of chloromethane. We focused ourselves on lowtemperatures, from 200 K to room temperature. The spectra were recordedwith a high resolution tunable diode laser spectrometer. For each line, ateach temperature, we measured the collisional half-width with four differentnitrogen pressures, ranging from 12 to 35 mbar.We retrieved the collisional N2-broadening coeffiients by fitting on the experimental lineshape the Voigt profile and the Rautian and Galatry models,which take into account the Dicke narrowing effect. We then analyzed thetemperature and the J dependences of the collisional broadening coefficient.Finally, we compared our results with previous studies.

M3 - Poster

ER -