INFRARED SPECTROSCOPY IN SLIT SUPERSONIC EXPANSIONS
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Date
1988
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
A 50 cm absorption pathlength, 40 MHz sub-Doppler linewidths, 5 K rotational temperatures. $10^{17}/cm^{3}$ number density, and detection limits of $5 \times 10^{7}$ moleculas/cm/quantum state for direct absorption: these are the advantages of spectroscopy in a slit supersonic expansion. A system is described which includes a 200-1000 usec duration, 60 Hz repetition rate pulsed valve with a 4 cm long by 75 pa wide slit nozzle and multipass optics. Examples are presented from the near-IR $(2-4 \mu m)$ spectra of hydrocarbons and van der Walls complexes.
Description
Author Institution: Joint Institute for Laboratory Astrophysics, National Bureau of Standards and University of Colorado