Measurements of argon collision broadening in the CN B 2Sigma(+) transition from X 2Sigma(+) (0,0) spectrum

Details Measurements of argon collision broadening in the CN B 2Sigma(+) transition from X 2Sigma(+) (0,0) spectrum Measurements of argon collision broadening in the CN B 2Sigma(+) transition from X 2Sigma(+) (0,0) spectrum

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jqsrt..53..481w&link_type=abstract

Journal of Quantitative Spectroscopy & Radiative Transfer (ISSN 0022-4073), vol. 53, no. 5, p. 481-492

Physics

2

Absorption Spectra, Absorptivity, Argon, Collision Parameters, Cyanides, Molecular Collisions, Spectral Line Width, Temperature Dependence, Experiment Design, Laser Spectroscopy, Photolysis, Rotational States, Spectrum Analysis, Voigt Effect

Scientific paper

Absorption line shapes in the (0,0) band of the B transition from X violet system of CN are measured in shock tube experiments using a rapid-tuning narrow-line ring dye laser. Excimer photolysis at 193 nm and high temperature pyrolysis of C2N2-Ar mixtures are used for CN generation. In experiments using the shock tube as a room temperature (298 K) cell, the rotational quantum number (N(double prime)) dependence of the CN-Ar collision broadening coefficient is determined by modeling the recorded line shapes with Voigt profiles. Transitions in the P-branch with lower state rotational quantum numbers of N(double prime) = 4 - 14 are probed; the expression 2 gamma(T = 298 K, CN-Ar) (/cm/atm) = 0.0560 exp(-0.201 N(double prime)) + 0.11 results. Shock tube experiments over the temperature range 1200-4500 K are used to determine the temperature dependence of the collision broadening coefficient, resulting in the expression 2 gamma(sub CN-Ar) (/cm/atm) = 2 gamma(T = 298K, CN-Ar) (298/T(K))(exp 0.8) valid for temperatures from 298 to 4500 K. Additional measurements confirm the magnitude of the (0,0) band oscillator strength and validate the spectral absorption coefficients calculated with spectroscopic model of the CN B transition from X(0,0) system for a wide range of conditions.

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