Microwave spectra of molecules of astrophysical interest XII. Hydroxyl radical

Beaudet, Robert A.; Poynter, R. L.

doi:10.1063/1.555570

Cited by 50 publications

(34 citation statements)

References 131 publications

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“…We use here the transitions tabulated in the JPL database 2 (Pickett et al 1998). These predictions are based on the laboratory measurements of Beaudet & Poynter (1978) and Brown & Schubert (1982).…”

Section: Introductionmentioning

confidence: 99%

Detection of OD towards the low-mass protostar IRAS 16293−2422

Parise

Liu

et al. 2012

A&A

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Context. Although water is an essential and widespread molecule in star-forming regions, its chemical formation pathways are still not very well constrained. Observing the level of deuterium fractionation of OH, a radical involved in the water chemical network, is a promising way to infer its chemical origin. Aims. We aim at understanding the formation mechanisms of water by investigating the origin of its deuterium fractionation. This can be achieved by observing the abundance of OD towards the low-mass protostar IRAS 16293−2422, where the HDO distribution is already known. Methods. Using the GREAT receiver on board SOFIA, we observed the ground-state OD transition at 1391.5 GHz towards the lowmass protostar IRAS 16293−2422. We also present the detection of the HDO 1 11 -0 00 line using the APEX telescope. We compare the OD/HDO abundance ratio inferred from these observations with the predictions of chemical models.Results. The OD line is detected in absorption towards the source continuum. This is the first detection of OD outside the solar system. The SOFIA observation, coupled to the observation of the HDO 1 11 -0 00 line, provides an estimate of the abundance ratio OD/HDO ∼ 17-90 in the gas where the absorption takes place. This value is fairly high compared with model predictions. This may be reconciled if reprocessing in the gas by means of the dissociative recombination of H 2 DO + further fractionates OH with respect to water.Conclusions. The present observation demonstrates the capability of the SOFIA/GREAT instrument to detect the ground transition of OD towards star-forming regions in a frequency range that was not accessible before. Dissociative recombination of H 2 DO + may play an important role in setting a high OD abundance. Measuring the branching ratios of this reaction in the laboratory will be of great value for chemical models.

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Section: Introductionmentioning

confidence: 99%

Detection of OD towards the low-mass protostar IRAS 16293−2422

Parise

Liu

et al. 2012

A&A

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“…The recent tabulation of Beaudet and Poynter (1978) shows that the ' OH frequencies are close enough to those of ' OH that if a frequency overlap occurred in one it should occur in the other, as well.…”

Section: Hll/oh Regionsmentioning

confidence: 94%

Physical characteristics of astronomical masers

Elitzur

1982

Rev. Mod. Phys.

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The radio line emission of interstellar molecules routinely shows deviations from thermal equilibrium which culminate with strong maser radiation in some sources. Like its laboratory counterpart, the maser radiation is amplified through the effect of induced processes in a region where a population inversion exists and displays many of the basic features of laboratory lasers. This review is intended to explain the basic theory of astronomical rnasers and to survey the theoretical models which were developed for specific sources. CONTENTS

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“…The interested reader is therefore referred to the literature [18][19][20][21][22], However, the effect of the total inversion operator E* (inversion of all coordinates) on the basis states is given by (28) with s" -0 for all but X~ states where s" = 1.…”

Section: The Molecular Basis Statesmentioning

confidence: 99%

“…These are the hyperfine parameters (a,b,c, and d), the A-doubling parameters (p and q), and the spin-orbit interaction constant A. Numerical values for these parameters have been obtained from Beaudet and Poynter [28] for the electronic ground state (X2n)ofOH.…”

Section: -4mentioning

confidence: 99%

Quantum optimal control theory applied to transitions in diatomic molecules

Lysebo

Veseth

2014

Phys. Rev. A

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Quantum optimal control theory is applied to control electric dipole transitions in a real multilevel system. The specific system studied in the present work is comprised of a multitude of hyperfine levels in the electronic ground state of the OH molecule. Spectroscopic constants are used to obtain accurate energy eigenstates and electric dipole matrix elements. The goal is to calculate the optimal time-dependent electric field that yields a maximum of the transition probability for a specified initial and final state. A further important objective was to study the detailed quantum processes that take place during such a prescribed transition in a multilevel system. Two specific transitions are studied in detail. The computed optimal electric fields as well as the paths taken through the multitude of levels reveal quite interesting quantum phenomena.

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Microwave spectra of molecules of astrophysical interest XII. Hydroxyl radical

Cited by 50 publications

References 131 publications

Detection of OD towards the low-mass protostar IRAS 16293−2422

Detection of OD towards the low-mass protostar IRAS 16293−2422

Physical characteristics of astronomical masers

Quantum optimal control theory applied to transitions in diatomic molecules

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