𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Pressure-Broadened Linewidth Measurements in the ν2Band of the CH3Radical

✍ Scribed by Gary N. Robinson; Mark S. Zahniser; Andrew Freedman; David D. Nelson; Jr.

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
105 KB
Volume
176
Category
Article
ISSN
0022-2852

No coin nor oath required. For personal study only.

✦ Synopsis

Pressure broadening coefficients for an infrared transition of the methyl radical have been measured for the first time. CH 3 radicals, generated by pyrolyzing di-tert-butyl peroxide in a flow of either N 2 or Ar, were probed using a tunable diode laser and a multipass absorption cell. The Lorentz half-width of the Q(6,6) line of the n 2 band of CH 3 at 607.024 cm 01 was measured as a function of pressure at 295 K. The broadening coefficients (HWHM) are b(Ar) Å 0.0310 { 0.0012 cm 01 atm 01 and b(N 2 ) Å 0.0390 { 0.0020 cm 01 atm 01 . These coefficients are lower than those for CH 4 -Ar, N 2 broadening. This may be due to a lower polarizability or smaller effective hard collision diameter for CH 3 relative to CH 4 .

📜 SIMILAR VOLUMES

Air-Broadened Linewidth Measurements in
Air-Broadened Linewidth Measurements in the ν2 Vibrational Band of the Hydroperoxyl Radical
✍ D.D. Nelson; M.S. Zahniser 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 375 KB

We have measured the air-broadening coefficient for one of the strongest infrared absorption lines of the hydroperoxyl radical-the \(9_{19} \leftarrow 8_{18} F_{1}, F_{2}\) doublet of the \(\nu_{2}\) band at \(1411.18 \mathrm{~cm}^{-1}\). We obtain a value of \(b=0.107 \pm 0.009 \mathrm{~cm}^{-1} \m

Diode-Laser Measurements of O2-Broadenin
Diode-Laser Measurements of O2-Broadening Coefficients in the ν3Band of CH3D
✍ Kathy Jacquiez; Ghislain Blanquet; Jacques Walrand; Jean-Pierre Bouanich 📂 Article 📅 1996 🏛 Elsevier Science 🌐 English ⚖ 144 KB

O 2 -broadening coefficients have been measured for 29 lines of 12 CH 3 D in the Q P and Q R branches of the n 3 band, using a tunable diode-laser spectrometer. The collisional widths obtained by fitting Rautian profiles to the measured shapes of the lines are significantly larger than those derived