Time-resolved frequency modulation spectroscopy of photochemical transients
Journal Article
·
· Journal of Chemical Physics; (United States)
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
- Department of Chemistry, Brookhaven National Laboratory, P.O. Box 5000, Upton, New York 11973-5000 (United States)
We report the use of time-resolved frequency modulation (FM) spectroscopy for the measurement of photochemically generated radicals. CN radicals from the 193 nm photodissociation of cyanogen (NCCN) have been detected using a phase-modulated cw Ti:sapphire ring laser, probing single rotational lines of the [ital A] [sup 2][Pi][l arrow][ital X] [sup 2][Sigma] system. The combination of sensitivity with time and frequency resolution is more than adequate to record Doppler-broadened line shapes of collisionless photofragments. Significant signal-to-noise enhancement is demonstrated compared to a dual-beam transient absorption technique.
- DOE Contract Number:
- AC02-76CH00016; FG02-87ER13671
- OSTI ID:
- 7283280
- Journal Information:
- Journal of Chemical Physics; (United States), Journal Name: Journal of Chemical Physics; (United States) Vol. 101:2; ISSN JCPSA6; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500 -- Photochemistry
664200* -- Spectra of Atoms & Molecules & their Interactions with Photons-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
CHEMISTRY
CYANOGEN
DOPPLER EFFECT
ELECTROMAGNETIC RADIATION
ENERGY LEVELS
EXCITED STATES
FREQUENCY MODULATION
LASER SPECTROSCOPY
LINE WIDTHS
MODULATION
PHOTOCHEMISTRY
PRODUCTION
RADIATIONS
RADICALS
RESOLUTION
ROTATIONAL STATES
SIGNAL-TO-NOISE RATIO
SPECTROSCOPY
TIME RESOLUTION
TIMING PROPERTIES
ULTRAVIOLET RADIATION
400500 -- Photochemistry
664200* -- Spectra of Atoms & Molecules & their Interactions with Photons-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
CHEMISTRY
CYANOGEN
DOPPLER EFFECT
ELECTROMAGNETIC RADIATION
ENERGY LEVELS
EXCITED STATES
FREQUENCY MODULATION
LASER SPECTROSCOPY
LINE WIDTHS
MODULATION
PHOTOCHEMISTRY
PRODUCTION
RADIATIONS
RADICALS
RESOLUTION
ROTATIONAL STATES
SIGNAL-TO-NOISE RATIO
SPECTROSCOPY
TIME RESOLUTION
TIMING PROPERTIES
ULTRAVIOLET RADIATION