Use of a free-expansion jet in ultra-high-resolution Raman spectroscopy

Conference · Thu Jan 01 04:00:00 EST 1981

DOI:https://doi.org/10.1016/0009-2614(80)80586-0· OSTI ID:6443641

Valentini, J J; Esherick, P; Owyoung, A

Rotationally-resolved, ultra-high-resolution stimulated Raman spectra of CH/sub 4/, CD/sub 4/, and SF/sub 6/ have been obtained in cw and pulsed free-expansion jets, using a simple and inexpensive nozzle-and-vacuum-chamber apparatus. Through variation of the nozzle orifice diameter, nozzle backing pressure, and axial location of the spectroscopic probe region it is possible to nearly independently control the spectral Doppler width, rotational temperature, and molecular density in the jet. Using relatively mild expansion conditions, it is possible to cool a pure methane jet to a rotational temperature of 13K. It is shown how this control of temperature, independent of density, allows separation of otherwise unresolvable spectral features and unambiguous identification of band-heads, hot-bands, and other spectral features.

• Research Organization: Los Alamos National Lab., NM (USA); Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6443641
• Report Number(s): LA-UR-81-1690; CONF-810429-36; ON: DE81025386
• Country of Publication: United States
• Language: English

Related Subjects

640301* -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALKANES
BEAMS
DATA
DEUTERIUM COMPOUNDS
EXPERIMENTAL DATA
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HYDROCARBONS
HYDROGEN COMPOUNDS
INFORMATION
JETS
METHANE
MOLECULAR BEAMS
NOZZLES
NUMERICAL DATA
ORGANIC COMPOUNDS
RAMAN SPECTRA
RESOLUTION
SPECTRA
SULFUR COMPOUNDS
SULFUR FLUORIDES