Rotationally resolved absorption cross sections of formaldehyde in the 28100-28500 cm -1 (351-356 nm) spectral region

Implications for in situ LIF measurements

Dick T Co, Thomas F. Hanisco, James G. Anderson, Frank N. Keutsch

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

The rotationally resolved ultraviolet absorption cross sections for the 2 0 04 0 1 vibrational band of the A 1A 2-X 1A 1 electronic transition of formaldehyde (HCHO) at an apodized resolution of 0.027 cm -1 (approximately 0.0003 nm at 352 nm) over the spectral range 28100-28500 cm -1 (351-356 nm) at 298 and 220 K, using Fourier transform spectroscopy, are first reported here. Accurate rotationally resolved cross sections are important for the development of in situ HCHO laser-induced fluorescence (LIF) instruments and for atmospheric monitoring. Pressure dependence of the cross sections between 75 and 400 Torr at 298 K was explored, and an average pressure broadening coefficient in dry air of 1.8 × 10 -4 cm -1 Torr -1 for several isolated lines is reported. Gaseous HCHO was quantitatively introduced into a flow cell by evaporating micronsized droplets of HCHO solution, using a novel microinjector technique. The condensed-phase concentrations of HCHO were determined by iodometric titrations to an accuracy of -1) obtained with our calibration technique are in excellent agreement with previous measurements. A maximum differential cross section of 5.7 × 10 -19 cm 2 molecule -1 was observed at high resolution-almost an order of magnitude greater than any previously reported data at low resolution.

Original languageEnglish
Pages (from-to)10675-10682
Number of pages8
JournalJournal of Physical Chemistry A
Volume109
Issue number47
DOIs
Publication statusPublished - Dec 1 2005

Fingerprint

formaldehyde
laser induced fluorescence
absorption cross sections
Formaldehyde
Fluorescence
Lasers
cross sections
Titration
pressure broadening
Fourier transforms
ultraviolet absorption
Spectroscopy
Calibration
titration
pressure dependence
Molecules
Monitoring
Air
high resolution
air

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Rotationally resolved absorption cross sections of formaldehyde in the 28100-28500 cm -1 (351-356 nm) spectral region : Implications for in situ LIF measurements. / Co, Dick T; Hanisco, Thomas F.; Anderson, James G.; Keutsch, Frank N.

In: Journal of Physical Chemistry A, Vol. 109, No. 47, 01.12.2005, p. 10675-10682.

Research output: Contribution to journalArticle

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