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 language | English |
|---|---|
| Pages (from-to) | 10675-10682 |
| Number of pages | 8 |
| Journal | Journal of Physical Chemistry A |
| Volume | 109 |
| Issue number | 47 |
| DOIs | |
| Publication status | Published - Dec 1 2005 |
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- 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 journal › Article
}
TY - JOUR
T1 - Rotationally resolved absorption cross sections of formaldehyde in the 28100-28500 cm -1 (351-356 nm) spectral region
T2 - Implications for in situ LIF measurements
AU - Co, Dick T
AU - Hanisco, Thomas F.
AU - Anderson, James G.
AU - Keutsch, Frank N.
PY - 2005/12/1
Y1 - 2005/12/1
N2 - 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.
AB - 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.
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U2 - 10.1021/jp053466i
DO - 10.1021/jp053466i
M3 - Article
VL - 109
SP - 10675
EP - 10682
JO - Journal of Physical Chemistry A
JF - Journal of Physical Chemistry A
SN - 1089-5639
IS - 47
ER -