Cryogenic multiple reflection absorption cell and Fourier transform spectrometer system for the far infrared

Autor:	A. Leung, H. P. Gush, E. H. Wishnow
Rok vydání:	1999
Předmět:	Diffraction Materials science Absorption spectroscopy Liquid helium business.industry Analytical chemistry Infrared spectroscopy Cryogenics Fourier transform spectroscopy law.invention Optics Far infrared law Fourier transform infrared spectroscopy business Instrumentation
Zdroj:	Review of Scientific Instruments. 70:23-31
ISSN:	1089-7623 0034-6748
DOI:	10.1063/1.1149537
Popis:	A far-infrared system used to measure weak absorption spectra of gases at pressures up to a few atmospheres and at temperatures as low as 20 K is described. The principal component is a multiple reflection mirror cell, cooled either with liquid nitrogen or with the boil-off gas from liquid helium. The cell, of 35 l volume, has an f/10 optical beam and a pathlength which can be varied from 4 to 60 m. At the longest pathlength diffraction limits the lowest usable frequency to 20 cm−1. The cell is coupled to a Fourier transform spectrometer and a 1.6 K bolometer. The apparatus has been used in a detailed study of the collision-induced pure translational band of H2, and the translation–rotation bands of N2 and N2–Ar mixtures.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7b684b1faeb5c07b0f20f6d23521aea5 https://doi.org/10.1063/1.1149537 Zobrazit plný text záznamu