Line shape analysis of Doppler broadened frequency-modulated line spectra

Journal Article · Thu Feb 01 04:00:00 EST 1996 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.470969· OSTI ID:277190

North, S W; Zheng, X S; Fei, R; Hall, G E ^[1]

---

1. Department of Chemistry, Brookhaven National Laboratory, Upton, New York 11973-5000 (United States)

We present a method for recovering Doppler broadened absorption line shapes from frequency modulated (FM) line spectra. The method of analysis is calibrated and demonstrated with thermalized CN radicals produced by photodissociation of cyanogen (NCCN), probed on the {ital A}{endash}{ital X} system near 800 nm with a frequency modulated Ti: sapphire ring laser. Nonthermal, Doppler broadened lines from translationally nascent photofragments can also be recovered by direct transformations of experimental FM line profiles acquired with a time resolution exceeding 100 ns. The superior signal-to-noise afforded by FM spectroscopy, relative to other direct absorption methods, should encourage the application of transient FM spectroscopy to problems in photoinitiated reaction dynamics. {copyright} {ital 1996 American Institute of Physics.}

• Research Organization: Brookhaven National Laboratory
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 277190
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 6 Vol. 104; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
66 PHYSICS
ABSORPTION SPECTROSCOPY
CYANOGEN
DOPPLER BROADENING
FREQUENCY MODULATION
LASER RADIATION
LEAST SQUARE FIT
LINE BROADENING
LINE SHAPE
LINE SPECTRA
PHOTOCHEMICAL REACTIONS
PHOTODISSOCIATION
SIGNAL-TO-NOISE RATIO