High-resolution interferometric Fourier transform infrared absorption spectroscopy in supersonic free jet expansions: carbon monoxide, nitric oxide, methane, ethyne, propyne, and trifluoromethane

Abstract

DMABN by two-color time-of-flight mass spectrometry (TOFMS). This has revealed absorption features due to two isomeric 1:1 DMABN-H20 complexes, one with AP = 14 cm"1 (also observed in LIF) and one with Ap = 199 cm"1 which was not observed in LIF but predominates in TOFMS. A DMABN-(H20)2 complex, invisible by LIF, was also found, with Ap = 401 cm"1. This work provides direct evidence of the existence of nonfluorescent DMABN-solvent complexes and supports the (40) Warren,

Sub-Doppler supersonic jet spectra of the coupled 6a10and 6b10vibronic bands of the S1(1B2u) ← S0(1A1g) transition in monodeuterobenzene and their rovibrational analysis

“…As can be seen from figure 4, the final simulations of the spectra provide an excellent agreement between experiment and simulation. The rotational temperatures for the best simulations are about 2 K. As this corresponds to (kT/hc) > 1 cm -1 >> A _~ B > C, even this low temperature is somewhat too high to observe effects arising from nuclear spin symmetry conservation in the supersonic jet expansion [42,43]. In figure 4 we also show a simulation for a rotational temperature of 1.5 K which does not show a dramatically poorer agreement with the experimental spectrum.…”

The near-infrared (1.30–1.70 μm) absorption spectrum of methane down to 77 K

“…Absorption spectra of methane cooled down to 77 K using cooled cells could already be investigated in several spectral regions [5][6][7][8][9][10][11][12], thanks to the important available vapor pressure (~10 Torr). Further cooling was also achieved by means of supersonic expansions [11,[13][14][15][16][17][18][19]. Though important, these achievements remain insufficient to allow an exhaustive and global modeling of the individual line parameters below 1.7 µm.…”

High Resolution Rovibrational Spectroscopy of Chiral and Aromatic Compounds

“…Of course, similar to the setup with our Bomem spectrometer, [16] one can also build an interface with a supersonic jet system. [14] The FTIR spectrum of the molecules presented here have been recorded in the region 600-3600 cm À1 . The instrumental resolution, defined by 1/MOPD (maximum optical path difference) ranged from 0.001-0.002 cm…”