title: Pulsed quantum cascade laser based hypertemporal real-time headspace measurements.
abstract: Optical cavity enhancement is a highly desirable process to make sensitive direct-absorption spectroscopic measurements of unknown substances, such as explosives, illicit material, or other species of interest. This paper reports advancements in the development of real-time cavity ringdown spectroscopy over a wide-bandwidth, with the aim to make headspace measurements of molecules at trace levels. We report results of two pulsed quantum cascade systems operating between (1200 to 1320)cm(-1) and (1316 to 1613)cm(-1) that measure the headspace of nitromethane, acetonitrile, acetone, and nitroglycerin, where the spectra are obtained in less than four seconds and contain at least 150,000 spectral wavelength datapoints.
authors.forename: Toby K
authors.initials: TK
authors.lastname: Boyson
authors.forename: Dylan R
authors.initials: DR
authors.lastname: Rittman
authors.forename: Thomas G
authors.initials: TG
authors.lastname: Spence
authors.forename: Maria E
authors.initials: ME
authors.lastname: Calzada
authors.forename: Abhijit G
authors.initials: AG
authors.lastname: Kallapur
authors.forename: Ian R
authors.initials: IR
authors.lastname: Petersen
authors.forename: K
authors.initials: K
authors.lastname: Paul Kirkbride
authors.forename: David S
authors.initials: DS
authors.lastname: Moore
authors.forename: Charles C
authors.initials: CC
authors.lastname: Harb