Observations of Population Inversion between the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Λ</mml:mi></mml:math>-Doublet States of OH

Meulen, J. J. ter; Meerts, W. Leo; Mierlo, G.W.M. van; Dymanus, A.

doi:10.1103/physrevlett.36.1031

Cited by 41 publications

(11 citation statements)

References 18 publications

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“…Circumstantial evidence for this is based on the preponderance of sources in which the strongest feature is the LHCP (as discussed in ). The velocity scale, with respect to the local standard of rest (lsr), employs rest frequencies of 6035.0932 and 6030.7485 MHz (ter Meulen et al 1976). Until now, most astronomical studies have used earlier, slightly lower, frequency estimates, for consistency with older work.…”

Section: Observations and Data Reductionmentioning

confidence: 99%

Spectra of OH masers at 6035 and 6030 MHz

Caswell

2003

Monthly Notices of the Royal Astronomical Society

138

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The Parkes radio telescope has been used to study circular polarization in the spectra of masers at the 6035-and 6030-MHz transitions of excited OH. The targets were 91 previously catalogued sites of 6035-MHz maser emission. A few were not detected, primarily because of variability. However, the 6035-MHz intensity variations seldom exceed a factor of 2 over several years, with a handful of dramatic exceptions.Towards many targets, the present observations have provided the first high-sensitivity search for the 6030-MHz transition and yielded 33 detections. All of the 6030-MHz maser features have 6035-MHz counterparts closely matching in velocity. For matching features, the 6030-MHz emission is most commonly weaker than the 6035-MHz emission by an order of magnitude but, in a few cases, is several times stronger. The detection statistics are well accounted for by very recent developments in maser modelling. However, the occasional occurrence of 6030-MHz maser emission stronger than at 6035-MHz poses a new challenge for the theory.Spectra with good frequency resolution at 6030 and 6035 MHz yield many valuable measurements of magnetic fields. At each transition, the field can be inferred from a small frequency separation between the right-hand and left-hand circularly polarized features, attributed to the Zeeman effect in a magnetic field of a few mG. In the many instances where a 'Zeeman pair' on the 6035-MHz spectrum has features matched by the 6030-MHz spectrum, this provides convincing corroboration of the magnetic field, in both direction and magnitude.Several prominent absorption features occur at 6035 MHz, and usually have matching absorption at 6030 MHz of similar, or slightly smaller, depth.

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Section: Observations and Data Reductionmentioning

confidence: 99%

Spectra of OH masers at 6035 and 6030 MHz

Caswell

2003

Monthly Notices of the Royal Astronomical Society

138

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“…Interest in these open-shell radical species stems from their importance in combustion and atmospheric environments, as well as from their complex rotational structure that exhibits spin-orbit and -doublet splittings. Ingenious methods have been developed to select OH ( 2 ) radicals in a single rotational (sub)level, to orient them in space, 5,6 and to tune their velocity. 7 These methods have allowed collision experiments of transient species at the fully state-resolved level, and have contributed enormously to our present understanding of how intermolecular potentials govern molecular collision dynamics.…”

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confidence: 99%

Communication: Magnetic dipole transitions in the OH A 2Σ+ ← X 2Π system

Kirste

Wang

Meijer

et al. 2012

The Journal of Chemical Physics

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We report on the observation of magnetic dipole allowed transitions in the well-characterized A 2 + − X 2 band system of the OH radical. A Stark decelerator in combination with microwave Rabi spectroscopy is used to control the populations in selected hyperfine levels of both -doublet components of the X 2 3/2 , v = 0, J = 3/2 ground state. Theoretical calculations presented in this Communication predict that the magnetic dipole transitions in the A 2 + , v = 1 ← X 2 , v = 0 band are weaker than the electric dipole transitions by a factor of 2.58 × 10 3 only, i.e., much less than commonly believed. Our experimental data confirm this prediction.

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“…OH molecular beams have been successfully produced [28][29][30][31][32][33], slowed by Stark decelerators [34,35], and even trapped in an electrostatic well [36]. Figure 3 gives the stark energy structure pattern of OH molecules of quantum rotational state of J 3∕2 in external electric fields.…”

Section: Stark Potential Of Oh Moleculesmentioning

confidence: 99%

Controllable electrostatic surface storage ring with opened optical access for cold polar molecules on a chip

Deng

et al. 2013

J. Opt. Soc. Am. B

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In order to meet the demands for laser manipulations and detection of cold molecules, we propose an optically accessible and controllable electrostatic surface storage ring for cold polar molecules on a chip, which is one based on extension and application of the three-wire surface guiding scheme [J. Opt. Soc. Am. B 25, 1214]. To our knowledge, this is the first real surface storage ring scheme. The spatial distribution of the electrostatic fields generated by two insulator-embedded charged rings and a grounded conductor plate is numerically calculated. Relationships between the height of the trap center above the surface and the setup parameters are analyzed in detail. Using OH radical molecules as a tester, the range of molecular velocities that the storage ring can confine is investigated. The dynamical process of weak-field-seeking OH molecules of state jJ; KMi j3∕2; − 9∕4i being loaded into and confined in the storage ring is studied using Monte Carlo simulations. Dependencies of translational temperature of molecules and their trapping efficiency in the storage ring on parameters of the setup and the initial molecular beam are examined. By incorporating a bunching function into our scheme, the number of round trips a trapped molecular packet makes can be improved by almost three times before getting spread out to fill the whole storage ring, as confirmed by numerical simulations.

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Observations of Population Inversion between theΛ-Doublet States of OH

Cited by 41 publications

References 18 publications

Spectra of OH masers at 6035 and 6030 MHz

Spectra of OH masers at 6035 and 6030 MHz

Communication: Magnetic dipole transitions in the OH A 2Σ+ ← X 2Π system

Controllable electrostatic surface storage ring with opened optical access for cold polar molecules on a chip

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