✦ LIBER ✦

Spectral Intensity and Lineshape Measurements in the First Overtone Band of HF Using Tunable Diode Lasers

✍ Scribed by Shang-I Chou; Douglas S. Baer; Ronald K. Hanson

Publisher: Elsevier Science
Year: 1999
Tongue: English
Weight: 154 KB
Volume: 195
Category: Article
ISSN: 0022-2852
DOI: 10.1006/jmsp.1999.7805

No coin nor oath required. For personal study only.

✦ Synopsis

High-resolution absorption lineshapes for the P(3) and P( 6) transitions of the first overtone (v ϭ 2-0) band of HF at 296 K have been measured using a pair of distributed feedback diode lasers operating near 1.31 and 1.34 m, respectively. Spectral line intensities and self-broadening parameters were determined by fitting the measured spectra with Voigt, Galatry, and Rautian lineshape models. Voigt profiles fit the low-pressure (Ͻ10 Torr) spectra of the P(3) transition reasonably well due to the relatively strong collisional broadening effect. Lineshape measurements of the P( 6) transition (for pressures ranging from 5 to 60 Torr) show significant variation from the Voigt lineshape model due to velocity-changing collisions that effectively reduce the Doppler component of the spectral line. Lineshape models that include motional (Dicke) narrowing effects, Galatry (soft collision) and Rautian (hard collision) profiles yield significant improvements in the spectral lineshape fits compared with Voigt profiles. The collisional broadening coefficient (␥) of the P( 6) transition obtained from a Voigt fit is ϳ4% lower than those found with either Galatry or Rautian profile fits. The measured intensities and self-broadening coefficients are compared with values in the HITRAN database and previous measurements.

📜 SIMILAR VOLUMES

Diode–Laser Measurements of He-, Ar-, an

Diode–Laser Measurements of He-, Ar-, and N2-Broadened HF Lineshapes in the First Overtone Band

✍ Shang-I Chou; Douglas S. Baer; Ronald K. Hanson 📂 Article 📅 1999 🏛 Elsevier Science 🌐 English ⚖ 112 KB

High-resolution lineshapes of the HF P(3) and P( 6) transitions (2-0 band) have been recorded in a 14.9-cm long absorption cell (T ϭ 296 K) using a pair of (InGaAsP)-distributed feedback diode lasers operating near 1.31 and 1.34 m, respectively. The absorption lineshapes were least-squares fit to Vo

High-Resolution Measurements of HBr Tran

High-Resolution Measurements of HBr Transitions in the First Overtone Band Using Tunable Diode Lasers

✍ Shang-I Chou; Douglas S. Baer; Ronald K. Hanson 📂 Article 📅 2000 🏛 Elsevier Science 🌐 English ⚖ 116 KB

High-resolution absorption lineshapes of the R(7) and P(2) transitions in the first overtone (v ϭ 0 -2) band of H 79 Br have been recorded at room temperature using a pair of distributed feedback diode lasers operating near 1.95 and 2.00 m, respectively. Spectral line intensities and self-broadening

Infrared Line Strengths and Pressure Bro

Infrared Line Strengths and Pressure Broadening Coefficients in the ν12 Vibrational Band of Hydrazine Measured by Infrared Tunable Diode Laser Spectroscopy

✍ Susan E. Plunkett; Mark S. Zahniser; Milton E. Parrish; David D. Nelson; Joanne 📂 Article 📅 2002 🏛 Elsevier Science 🌐 English ⚖ 339 KB

Infrared line positions, linestrengths, and pressure-broadening coefficients are required to determine absolute trace gas concentrations from high-resolution absorption spectra. We have measured these values for the infrared absorption lines in the ν 12 band (antisymmetric wag) of hydrazine between

Absolute ν2 Line Intensities of HOCl by

Absolute ν2 Line Intensities of HOCl by Simultaneous Measurements in the Infrared with a Tunable Diode Laser and Far-Infrared Region Using a Fourier Transform Spectrometer

✍ J. Vander Auwera; J. Kleffmann; J.-M. Flaud; G. Pawelke; H. Bürger; D. Hurtmans; 📂 Article 📅 2000 🏛 Elsevier Science 🌐 English ⚖ 349 KB

We have measured absolute line intensities in the 2 fundamental band at 1238 cm Ϫ1 of both isotopomers of hypochlorous acid, HOCl. To obtain the partial pressure of the species in the sample mixture, unavailable through direct measurement since HOCl exists only in equilibrium with H 2 O and Cl 2 O a

Stabilized Tunable Diode Laser Measureme

Stabilized Tunable Diode Laser Measurements of the P(2) Line in the 13CO Fundamental Band Broadened by Helium at Temperatures between 11.5 and 298.6 K

✍ A.W. Mantz; A. Henry; A. Valentin 📂 Article 📅 2001 🏛 Elsevier Science 🌐 English ⚖ 175 KB

Volume 211, Number 2 (2002), in the arti

Volume 211, Number 2 (2002), in the article “Infrared Line Strengths and Pressure Broadening Coefficients in the ν12 Vibrational Band of Hydrazine Measured by Infrared Tunable Diode Laser Spectroscopy,” by Susan E. Plunkett, Mark S. Zahniser, Milton E. Parrish, David D. Nelson, Joanne H. Shorter, Joda Wormhoudt, and Kenneth H. Shafer, pp. 241–247 (

📂 Article 📅 2002 🏛 Elsevier Science 🌐 English ⚖ 27 KB

FIG. 6. Plot of integrated absorption from 965.4774 to 965.6633 cm -1 versus hydrazine column density (number density times path length). The slope is the integrated line strength for this spectral region.