ARGON BROADENING OF THE R(48), R(50) AND R(52) LINES OF CO2 IN THE (00-DEGREES-1)[-(00-DEGREES-0) BAND

A c.w. narrow-line lead-salt diode laser was used to measure the fully resolved absorption line shape of the R(50) line of CO2 in the nu(3) band (00(0)1) <-- (00(0)0) at 2380.72 cm(-1) in shock-heated mixtures of CO2-Ar. The line strength S (cm(-2) atm(-1)) and collisional-broade ning coefficient 2 gamma(CO2-Ar) (cm(-1) atm(-1)) were determined from rapid-scanning experiments conducted over the temperature range 300-1 860 K. Collisional-broadening coefficients for the R(48), R(50) and R( 52) lines were determined from fixed-frequency experiments conducted o ver the temperature range 300-2290 K. for the assumed form gamma(T)/ga mma(T-ref) = (T/T-ref)(-n), the exponent n was determined to be 0.61 w ith gamma(T-ref) = 0.0498 (cm(-1) atm(-1)) (HWHM) and T-ref = 298 K. N o J(n) dependence to gamma(CO2-Ar) was observed for this limited range of high-J(n) transitions. (C) 1997 Elsevier Science Ltd.