			15min:

CAVITY RINGDOWN LASER ASORPTION SPECTROSCOPY(CRLAS) of ISOTOPICALLY LABELED ACETYLENE BETWEEN 12,500 - 13,600 cm^-1.

CHRISTOPHER J. LUE, MICHAEL N. SULLIVAN, MARK E. DRAGANJAC AND SCOTT W. REEVE, Arkansas Center for Laser Applications and Science and Department of Chemistry and Physics, Arkansas State University, P.O. Box 419, State University, AR 72467.

About five years ago, Arkansas State University created the Arkansas Center for Laser Applications and Science (ArCLAS) with the intention of making it a state-of-the-art facility for laser-based research and optical spectroscopy in the midSouth. Since that time, University and DoD support has lead to the acquisition of numerous laser based spectrometers including a novel three color picosecond system utilized primarily for STIRAP measurements of bulk gas samples. Over the past few months, we have begun collecting near infrared overtone and combination band spectra for the acetylene molecule with a pulsed cavity ringdown laser absorption spectrometer (CRDLAS) as part of the STIRAP support effort. Certainly acetylene has been extensively studied by a number of different spectroscopic methods . During these CRDLAS investigations a ¹³C₂H₂ band was discovered which we believe has not been previously reported. Here a complete rovibrational analysis of this band will be presented.