Published in Journal of Molecular Spectroscopy
Using the latest published, empirically refined potential energy surface (PES) Ames- 1 and purely ab initio CCSD (T)/aug-cc-pV (Q+ d) Z dipole moment surface (DMS), we have computed infrared line lists for five symmetric isotopologues of sulfur dioxide: 32 S 16 O 2 (626), 33 S 16 O 2 (636), 34 S 16 O 2 (646), 36 S 16 O 2 (666), and 32 S 18 O 2 (828...
Published in Journal of Molecular Spectroscopy
Ethylene glycol in its ground conformation has tunneling transition with the frequency about 7GHz. This leads to a rather complicated tunneling–rotational spectrum. Because tunneling and rotational energies have different dependence on the electron-to-proton mass ratio μ, this spectrum is highly sensitive to the possible μ variation. We used simple...
Published in Journal of Molecular Spectroscopy
In order to improve the spectroscopic database for remote sensing of the giant planets, line positions and intensities are determined for the five bands (2ν2, ν2+ν4, 2ν4, ν1 and ν3) that comprise the Pentad of PH3 between 1950 and 2450cm−1. Knowledge of PH3 spectral line parameters in this region is important for the exploration of dynamics and che...
Published in Journal of Molecular Spectroscopy
We report the first intensity measurements for the very weak 20052-00001 band of the 2ν1+5ν3 triad of 13C16O2 near 734nm by high sensitivity Intracavity Laser Absorption Spectroscopy. A noise equivalent absorption αmin∼2×10−10cm−1 was achieved with an absorption pathlength equivalent to 50.3km. The derived intensity values (on the order of 10−28cm/...
Published in Journal of Molecular Spectroscopy
We show that the photoassociation (PA) rate of ultracold diatomic molecules in the vicinity of a Feshbach resonance could be used to probe variations of the electron-to-proton mass ratio β=me/mp, a quantity related to other fundamental constants via the ΛQCD scale. The PA rate exhibits two features near a Feshbach resonance, a minimum and a maximum...
Published in Journal of Molecular Spectroscopy
Four electronic transition systems, namely, the [12.7]3Π2 – [0.1]3Δ3, the [13.5]3Φ3 – [0.9]3Δ2, the [13.9]3Φ4 – [0.1]3Δ3, and the [13.9]3Π1 – [0.9]3Δ2 transitions of the ruthenium monocarbide molecule (RuC) were recorded and analyzed using laser vaporization/reaction supersonic free jet expansion and high resolution laser induced fluorescence spect...
Published in Journal of Molecular Spectroscopy
The 2Π(4p)–X2Π(3p) band system of AlAr has been observed using two-photon excitation. The spectrum consists of a short progression of doublet bands, with spin–orbit intervals that are close to that of Al(4p). Potential energy curve fitting yielded a bond dissociation energy for 2Π(4p) of De=495(5)cm−1 and an approximate bond length of Re=3.33(4)Å.
Published in Journal of Molecular Spectroscopy
The first investigation of the very weak 2ν1+3ν3 absorption band of nitrogen dioxide, 14N16O2, located at 7192.1587(1) cm−1 was performed using Fourier-transform incoherent broadband cavity-enhanced absorption spectroscopy (FT-IBBCEAS) in the 7080–7210cm−1 spectral range. The assigned 2ν1+3ν3 lines involve energy levels of the (203) vibrational sta...
Published in Journal of Molecular Spectroscopy
Using a tunable diode-laser spectrometer, we have measured the CO2-broadening coefficients of 28 absorption lines in the ν4 band of CH4. Each line was recorded at room temperature (296K) and at 4 different pressures, ranging from 8 to 50mbar. The experimental determination of the CO2-broadening coefficients was performed by fitting a theoretical pr...
Published in Journal of Molecular Spectroscopy
We use (1+1′) resonance-enhanced multiphoton photodissociation (REMPD) to detect the population in individual rovibronic states of trapped HfF+ with a single-shot absolute efficiency of 18%, which is over 200 times better than that obtained with fluorescence detection. The first photon excites a specific rotational level to an intermediate vibronic...
