Search results for: Muriel Lepère

Items from 1 to 20 out of 60 results

article

Isolated line shape of methane with various collision partners

Tuong Le, Laurent Fissiaux, Muriel Lepère, Ha Tran

Journal of Quantitative Spectroscopy and Radiative Transfer > 2016 > 185 > C > 27-36

In this work, the spectral profile of an isolated transition of methane broadened by Ar, N₂, O₂ and He was studied using different line-shape models, from the simple Voigt to the recently recommended Hartmann–Tran profiles. For each collision-partner, absorption spectra of the ν₄ 2A11-3A21 line of methane were measured at room temperature and pressures ranging from 28.26 to 95.50mbar, with a high...

article

H2 line-mixing coefficients in the ν2 and ν4 bands of PH3 at low temperature

Jamel Salem, Ghislain Blanquet, Muriel Lepère, Hassen Aroui

Journal of Quantitative Spectroscopy and Radiative Transfer > 2016 > 173 > C > 34-39

Using a tunable diode-laser spectrometer adapted with a low temperature cell, we have measured the H₂ line-mixing coefficients for 21 lines in the ^QR branch of the ν₂ band and in the ^PP and ^RP branches of the ν₄ band of phosphine (PH₃) at low temperature. These coefficients were determined using a multi-pressure fitting procedure that accounts for the apparatus function, the Doppler and the collisional...

article

Infrared spectroscopy at high temperature : N2- and O2-broadening coefficients in the ν4 band of CH4

Laurent Fissiaux, Jean-Claude Populaire, Ghislain Blanquet, Muriel Lepère

Journal of Molecular Spectroscopy > 2015 > 317 > C > 26-31

In the present work, we have developed a high-temperature absorption cell for infrared spectroscopy. This absorption cell can contain gases of the room temperature up to 650K without temperature gradient. The construction of the cell and its technical features are described in detail in this paper. In order to demonstrate the feasibility and the interest of the cell, we have measured the N₂-, O₂-...

article

O2-broadening coefficients of acetylene lines in the ν4+ν5 band at room temperature

Tuong Le, Laurent Fissiaux, Ha Tran, Muriel Lepère

Journal of Molecular Spectroscopy > 2015 > 314 > Complete > 48-53

Room temperature O₂-broadening coefficients were measured for 16 transitions, from P(23) to R(16), of the ν₄+ν₅ band of acetylene near 7.5μm. Absorption spectra of these lines were recorded at room temperature and various pressures, from 20.00mbar to 66.21mbar using a tunable diode laser spectrometer. The broadening coefficients were obtained by fitting the Voigt profile as well as the Rautian, the...

article

Study of acetylene diluted in xenon by diode-laser spectroscopy: I. Temperature dependence of the broadening coefficients

Miguël Dhyne, Pierre Joubert, Jean-Claude Populaire, Ghislain Blanquet, more

Journal of Quantitative Spectroscopy and Radiative Transfer > 2014 > 144 > Complete > 174-181

In this paper, we present the Xe-broadening coefficients of 18 rovibrational lines in the ν4+ν5 band of C212H2 (near 1330cm ⁻¹ ) determined at five temperatures, ranging from 173.2K to 298.2K. The measurement of these coefficients was realized with a tunable diode-laser spectrometer. A low temperature cell was coupled with the spectrometer in order to determine their temperature dependence...

article

N2-shift coefficients in the ν3 band of 12CH4 at room temperature

Bastien Vispoel, Miguël Dhyne, Jean-Claude Populaire, Ghislain Blanquet, more

Journal of Molecular Spectroscopy > 2014 > 298 > Complete > 7-10

Using a dual beam diode-laser spectrometer, we have studied with accuracy the N ₂ -shift coefficients in the P-branch of the ν ₃ band of methane. The experiments were performed at room temperature for 16 lines in the spectral range 2906–2948cm ⁻¹ with J values between 7 and 11. Each line was recorded at four different nitrogen pressures ranging from 17 to 302mbar. The collisional...

article

He-, Ne- and Kr-broadening coefficients of lines in the fundamental ν3 band of 12C32S2 at low temperature

Pardaillan Kongolo Tshikala, Jean-Claude Populaire, Ghislain Blanquet, Muriel Lepère

Journal of Molecular Spectroscopy > 2014 > 298 > Complete > 24-30

Using a tunable diode-laser spectrometer coupled with a low temperature cell, He-, Ne- and Kr-broadening coefficients of 8 lines in the fundamental ν ₃ band of CS ₂ have been measured at five low temperatures: 173K, 198K, 223K, 248K and 273K. These lines with J values ranging from 2 to 78 are located in the spectral range 1514–1544cm ⁻¹ , four lines in the P branch and four...

article

Temperature dependence of self-broadening of allene in the ν10 band

Laurent Fissiaux, Ghislain Blanquet, Jean-Claude Populaire, Muriel Lepère

Journal of Molecular Spectroscopy > 2014 > 296 > Complete > 24-27

Using a tunable diode-laser spectrometer, we have measured self-broadening coefficients of allene for 4 lines in the ν ₁₀ fundamental band near 11μm for three low temperatures (178.15, 208.15, and 243.65K). The collisional halfwidths are obtained by fitting the spectral lines with a Voigt and a Rautian profile. For these lines, the n parameter of the temperature dependence has been determined...

article

Diode-laser measurements of N2-broadening coefficients in the ν10 band of allene at low temperatures

Laurent Fissiaux, Ghislain Blanquet, Muriel Lepère

Journal of Quantitative Spectroscopy and Radiative Transfer > 2013 > 127 > Complete > 78-81

Using a tunable diode-laser spectrometer, we have measured the N ₂ -broadening coefficients of allene for 5 lines in the ν ₁₀ fundamental band near 11μm at five low temperatures ranging from 167.7K to 259.7K. The collisional halfwidths have been obtained by fitting the spectral lineshapes with the Voigt and the Rautian profiles. For these lines, the n parameter of the temperature dependence...

article

Femto-FT-CEAS applied to carbon disulfide around 1.54μm

Xavier de Ghellinck d’Elseghem Vaernewijck, Pardaillan Kongolo Tshikala, Muriel Lepère, Michel Herman

Journal of Molecular Spectroscopy > 2012 > 282 > Complete > 27-29

A femto–OPO laser fitted to a high-finesse cavity and a Fourier transform spectrometer to perform femto-FT-CEAS (for femto-Fourier transform-cavity enhanced spectroscopy) was used to record high overtones of carbon disulfide with a minimal rms equivalent absorption coefficient of 1.2×10 ⁻¹¹ cm ⁻¹ Hz ^−1/2 per spectral element. New vibrational states are reported for ¹² ...

article

Diode-laser measurements of N2-broadening coefficients in the ν10 band of allene at room temperature

Laurent Fissiaux, Ghislain Blanquet, Muriel Lepère

Journal of Quantitative Spectroscopy and Radiative Transfer > 2012 > 113 > 11 > 1233-1239

Using a tunable diode-laser spectrometer, we have measured the N ₂ -broadening coefficients of 32 absorption lines in the ν10 band of allene at room temperature. For each line under study, we have recorded spectra at five pressures of perturber gas ranging from 7 to 37mbar. The line profiles have been fitted, at each pressure, with different lineshape models. From these fits, we have obtained...

article

Study of the effect of perturber mass on collisional broadening coefficients of lines in the ν3 band of CS2

Pardaillan Kongolo Tshikala, Ghislain Blanquet, Muriel Lepère

Journal of Molecular Spectroscopy > 2012 > 275 > Complete > 48-52

Using a tunable diode-laser spectrometer, we have recorded 28 lines in the fundamental ν ₃ band of carbon disulfide diluted in several rare gases: helium, neon and krypton. These lines are ranged from P(78) to R(72) and located in the spectral range 1514–1548cm ⁻¹ .The collisional half-widths of each line have been obtained by fitting to the experimental lineshape, a Voigt profile...

article

Absolute line intensities and self-broadening coefficients in the ν3−ν1 band of carbon dioxide

Quentin Delière, Laurent Fissiaux, Muriel Lepère

Journal of Molecular Spectroscopy > 2012 > 272 > 1 > 36-42

Using a tunable diode-laser spectrometer, we have measured the self-broadening coefficients and strengths of 26 absorption lines in the ν ₃ −ν ₁ band of ¹² CO ₂ and ¹³ CO ₂ at room temperature. These lines, ranging from P(34) to R(40), are located around 960.9 and 913.4cm ⁻¹ , respectively for the ¹² CO ₂ and ¹³ CO ...

article

Comparison of classical, semiclassical and quantum methods in hydrogen broadening of acetylene lines

Franck Thibault, Sergey V. Ivanov, Oleg G. Buzykin, Laura Gomez, more

Journal of Quantitative Spectroscopy and Radiative Transfer > 2011 > 112 > 9 > 1429-1437

Quantum close coupling (CC) calculations of H ₂ -broadening coefficients of infrared and isotropic Raman lines of acetylene (C ₂ H ₂ ) are performed for temperatures between 77 and 2000K. They are used to test three more approximate methods, the quantum coupled states (CS) theory, the semiclassical Robert–Bonamy (RB) formalism and the full classical (FC) model of Gordon. In...

article

Self-collisional broadening and shift coefficients of lines in the ν4+ν5 band of C212H2 from 173.2 to 298.2K by diode-laser spectroscopy

Miguël Dhyne, Pierre Joubert, Jean-Claude Populaire, Muriel Lepère

Journal of Quantitative Spectroscopy and Radiative Transfer > 2011 > 112 > 6 > 969-979

The pressure-induced self-shift and broadening coefficients for seven lines of C212H2 in the ν4+ν5 band located around 1330cm ⁻¹ have been measured using a tunable diode-laser spectrometer coupled with a low temperature absorption cell. The measurement of these coefficients was realized at five temperatures ranging from 173.2 to 273.2K (and also 298.2K for shift) in order to determine their...

article

O2- and air-broadening coefficients in the ν9 band of C2H6

Laurent Fissiaux, Ghislain Blanquet, Muriel Lepère

Journal of Quantitative Spectroscopy and Radiative Transfer > 2010 > 111 > 14 > 2037-2042

In the present work, we have measured the O ₂ - and air-broadening coefficients of, respectively, 19 and 26 absorption lines in the ν9 band of ethane at room temperature, using a tunable diode-laser spectrometer. For each line under study, we have recorded spectra at 5–10 pressures of perturber gas ranging from 3 to 22mbar. The line profiles have been fitted, at each pressure, with different...

article

Collisional broadening and shift coefficients of lines in the ν4+ν5 band of 12C2H2 diluted in N2 from low to room temperatures

Miguël Dhyne, Pierre Joubert, Jean-Claude Populaire, Muriel Lepère

Journal of Quantitative Spectroscopy and Radiative Transfer > 2010 > 111 > 7-8 > 973-989

The pressure-induced N2 shift and broadening coefficients for nine lines of 12C2H2 in the ν4+ν5 band located around 1330cm−1 were measured using a tunable diode-laser spectrometer coupled with a low temperature absorption cell. The measurement of these coefficients was realized at six temperatures (between 173.2 and 298.2K) in order to determine their temperature dependence. The broadening coefficients...

article

Temperature dependence of N2- and O2-broadening coefficients in the ν4 band of 13CH4

Bénédicte Martin, Muriel Lepère

Journal of Molecular Spectroscopy > 2010 > 259 > 1 > 46-55

Using a tunable diode laser spectrometer and an home made cooling cell, the N2- and O2-broadening coefficients of 13CH4 were measured at room and low temperatures in the ν4 band near 1300cm-1. Fifteen transitions were studied for the 13CH4 diluted in the nitrogen at room temperature and 11 of them were also studied at 273.0K, 248.0K, 223.0K, 198.0K and 173.0K. Twenty-four lines were considered at...

article

O2- and air-broadening coefficients in the ν4 band of 12CH4 at room temperature

Bénédicte Martin, Muriel Lepère

Journal of Molecular Spectroscopy > 2009 > 255 > 1 > 6-12

Using a diode laser spectrometer, 50 collisional broadening coefficients in the ν4 band of methane perturbed by oxygen have been measured at room temperature. We have analyzed ro-vibrational lines in the P- and R-branches with J values between 1 and 12 located in the spectral range between 1241.861 and 1373.201cm ⁻¹ . The Voigt and Rautian profiles have been used to determine the collisional...

article

N2-broadening coefficients of ethane

Ghislain Blanquet, Jean Vander Auwera, Muriel Lepère

Journal of Molecular Spectroscopy > 2009 > 255 > 1 > 72-74

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Keywords

DIODE-LASER (18)
COLLISIONAL BROADENING (13)
INFRARED SPECTROSCOPY (9)
TEMPERATURE DEPENDENCE (8)
TUNABLE DIODE-LASER (8)
ACETYLENE (7)
BROADENING COEFFICIENTS (7)
METHANE (7)
CARBON DISULFIDE (6)
OXYGEN (5)
SELF-BROADENING (5)
DIODE-LASER SPECTROSCOPY (4)
NITROGEN (4)
ALLENE (3)
C2H2 (3)
CH3F (3)
ETHANE (3)
ETHYLENE (3)
LINE BROADENING (3)
METHYL FLUORIDE (3)
TUNABLE DIODE LASER (3)
ABSOLUTE LINE INTENSITIES (2)
AIR (2)
BAND-STRENGTH (2)
CARBON DIOXIDE (2)
DIODE LASER (2)
HYDROGEN (2)
LINE STRENGTHS (2)
LOW TEMPERATURE (2)
MONODEUTERATED METHANE (2)
N2-BROADENING (2)
PRESSURE BROADENING (2)
RARE GASES (2)
SELF-BROADENING COEFFICIENTS (2)
TUNABLE DIODE-LASER SPECTROMETER (2)
CH 3 F (1)
12CO2 (1)
13CO2 (1)
BROADENING (1)
CEAS (1)
CH4 (1)
CLASSICAL (1)
COLLISIONAL SHIFT (1)
COLLISIONAL-BROADENING (1)
CS2 (1)
CYANOGEN CHLORIDE (1)
DIODE LASER SPECTROMETER (1)
DIODE LASER SPECTROSCOPY (1)
DIODE-LASER SPECTROMETER (1)
EQUIVALENT WIDTH METHOD (1)
FEMTO LASER (1)
FTIR SPECTROSCOPY (1)
HARTMANN–TRAN PROFILE (1)
HIGH SENSITIVITY ABSORPTION TECHNIQUE (1)
HIGH-TEMPERATURE (1)
LINE INTENSITIES (1)
LINE PROFILE (1)
LINE PROFILE FIT METHOD (1)
LINE SHAPE (1)
LINE SHIFTS (1)
LINE-SHAPE (1)
LINESHAPE (1)
LINEWIDTHS (1)
OVERTONE SPECTROSCOPY (1)
PRESSURE DEPENDENCE (1)
ROOM TEMPERATURE (1)
SELF-BROADENINGS (1)
SELF-SHIFT (1)
SEMICLASSICAL AND QUANTUM METHODS (1)
SEMICLASSICAL APPROACH (1)
SEMICLASSICAL THEORY (1)
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INFONA - science communication portal

Search results for: Muriel Lepère

Isolated line shape of methane with various collision partners

H2 line-mixing coefficients in the ν2 and ν4 bands of PH3 at low temperature

Infrared spectroscopy at high temperature : N2- and O2-broadening coefficients in the ν4 band of CH4

O2-broadening coefficients of acetylene lines in the ν4+ν5 band at room temperature

Study of acetylene diluted in xenon by diode-laser spectroscopy: I. Temperature dependence of the broadening coefficients

N2-shift coefficients in the ν3 band of 12CH4 at room temperature

He-, Ne- and Kr-broadening coefficients of lines in the fundamental ν3 band of 12C32S2 at low temperature

Temperature dependence of self-broadening of allene in the ν10 band

Diode-laser measurements of N2-broadening coefficients in the ν10 band of allene at low temperatures

Femto-FT-CEAS applied to carbon disulfide around 1.54μm

Diode-laser measurements of N2-broadening coefficients in the ν10 band of allene at room temperature

Study of the effect of perturber mass on collisional broadening coefficients of lines in the ν3 band of CS2

Absolute line intensities and self-broadening coefficients in the ν3−ν1 band of carbon dioxide

Comparison of classical, semiclassical and quantum methods in hydrogen broadening of acetylene lines

Self-collisional broadening and shift coefficients of lines in the ν4+ν5 band of C212H2 from 173.2 to 298.2K by diode-laser spectroscopy

O2- and air-broadening coefficients in the ν9 band of C2H6

Collisional broadening and shift coefficients of lines in the ν4+ν5 band of 12C2H2 diluted in N2 from low to room temperatures

Temperature dependence of N2- and O2-broadening coefficients in the ν4 band of 13CH4

O2- and air-broadening coefficients in the ν4 band of 12CH4 at room temperature

N2-broadening coefficients of ethane

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