Rotational transition
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Rotational spectroscopy, tentative interstellar detection, and chemical modeling of N-methylformamide Open
Context. N-methylformamide, CH3NHCHO, may be an important molecule for interstellar pre-biotic chemistry because it contains a peptide bond, which in terrestrial chemistry is responsible for linking amino acids in proteins. The rotational …
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Rotational State Microwave Mixing for Laser Cooling of Complex Diatomic Molecules Open
We demonstrate the mixing of rotational states in the ground electronic state using microwave radiation to enhance optical cycling in the molecule yttrium (II) monoxide (YO). This mixing technique is used in conjunction with a frequency mo…
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Optical angular momentum and atoms Open
Any coherent interaction of light and atoms needs to conserve energy, linear momentum and angular momentum. What happens to an atom’s angular momentum if it encounters light that carries orbital angular momentum (OAM)? This is a particular…
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Angular momentum transport efficiency in post-main sequence low-mass stars Open
Context. Using asteroseismic techniques, it has recently become possible to\nprobe the internal rotation profile of low-mass (~1.1-1.5 Msun) subgiant and\nred giant stars. Under the assumption of local angular momentum conservation,\nthe c…
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Rotational spectroscopy and three-wave mixing of 4-carvomenthenol: A technical guide to measuring chirality in the microwave regime Open
We apply chirality sensitive microwave three-wave mixing to 4-carvomenthenol, a molecule previously uncharacterized with rotational spectroscopy. We measure its rotational spectrum in the 2-8.5 GHz range and observe three molecular conform…
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Chirality and the angular momentum of light Open
Chirality is exhibited by objects that cannot be rotated into their mirror images. It is far from obvious that this has anything to do with the angular momentum of light, which owes its existence to rotational symmetries. There is neverthe…
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Hydrogen bonding in the ethanol–water dimer Open
We report the first rotational spectrum of the ground state of the isolated ethanol–water dimer using chirped-pulse Fourier transform microwave spectroscopy between 8–18 GHz.
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Rotational snap-through behavior of multi-stable beam-type metastructures Open
Metastructures consisting of planar arrangements of bi-stable snap-through beams are able to exhibit multiple stable configurations. Apart from the expected translational state transition, when all beam elements snap through, rotational st…
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Observation of Bloch Oscillations in Molecular Rotation Open
We report the observation of rotational Bloch oscillations in a gas of nitrogen molecules kicked by a periodic train of femtosecond laser pulses. A controllable detuning from the quantum resonance creates an effective accelerating potentia…
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Methyl Internal Rotation in the Microwave Spectrum of <i>o</i>‐Methyl Anisole Open
The microwave spectrum of o ‐methyl anisole (2‐methoxytoluene), CH 3 OC 6 H 4 CH 3, has been measured by using a pulsed molecular jet Fourier transform microwave spectrometer operating in the frequency range 2–26.5 GHz. Conformational anal…
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Long Rotational Coherence Times of Molecules in a Magnetic Trap Open
Polar molecules in superpositions of rotational states exhibit long-range dipolar interactions, but maintaining their coherence in a trapped sample is a challenge. We present calculations that show many laser-coolable molecules have conven…
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Rotational coherence of encapsulated ortho and para water in fullerene-C60 revealed by time-domain terahertz spectroscopy Open
We resolve the real-time coherent rotational motion of isolated water molecules encapsulated in fullerene-C 60 cages by time-domain terahertz (THz) spectroscopy. We employ single-cycle THz pulses to excite the low-frequency rotational moti…
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Cold Snapshot of a Molecular Rotary Motor Captured by High‐Resolution Rotational Spectroscopy Open
We present the first high‐resolution rotational spectrum of an artificial molecular rotary motor. By combining chirped‐pulse Fourier transform microwave spectroscopy and supersonic expansions, we captured the vibronic ground‐state conforma…
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Cooling of a Zero-Nuclear-Spin Molecular Ion to a Selected Rotational State Open
We demonstrate rotational cooling of the silicon monoxide cation via optical pumping by a spectrally filtered broadband laser. Compared with diatomic hydrides, SiO^{+} is more challenging to cool because of its smaller rotational interval.…
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Detection of the propargyl radical at <i>λ</i> 3 mm Open
We report the detection of the propargyl radical (CH 2 CCH) in the cold dark cloud TMC-1 in the λ 3 mm wavelength band. We recently discovered this species in space toward the same source at a wavelength of λ 8 mm. In those observations, v…
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Rotationally inelastic collisions of SiO with H2 Open
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From Gyroscopic to Thermal Motion: A Crossover in the Dynamics of Molecular Superrotors Open
Localized heating of a gas by intense laser pulses leads to interesting acoustic, hydrodynamic, and optical effects with numerous applications in science and technology, including controlled wave guiding and remote atmosphere sensing. Rota…
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QUANTUM CALCULATION OF INELASTIC CO COLLISIONS WITH H. II. PURE ROTATIONAL QUENCHING OF HIGH ROTATIONAL LEVELS Open
Carbon monoxide is a simple molecule present in many astrophysical environments, and collisional excitation rate coefficients due to the dominant collision partners are necessary to accurately predict spectral line intensities and extract …
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First detection of the HSO radical in space Open
We report the discovery of HSO towards several cold dark clouds. The detection is confirmed by the observation of the fine and hyperfine components of two rotational transitions in the protostellar core B1-b, using the Yebes 40 m and IRAM …
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Hyperfine-resolved optical spectroscopy of the A2Π ← X2Σ+ transition in MgF Open
We report on hyperfine-resolved laser spectroscopy of the A2Π ← X2Σ+ transition of magnesium monofluoride (MgF), relevant for laser cooling. We recorded 25 rotational transitions with an absolute accuracy of better than 20 MHz, assigned 56…
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Laboratory detection of the rotational-tunnelling spectrum of the hydroxymethyl radical, CH<sub>2</sub>OH Open
Context. Of the two structural isomers of CH 3 O, methoxy is the only radical whose astronomical detection has been reported through the observation of several rotational lines at 2 and 3 mm wavelengths. Although the hydroxymethyl radical,…
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Rotational motion of triaxially deformed nuclei studied by the microscopic angular-momentum-projection method. II. Chiral doublet band Open
In the sequel of the present study, we have investigated the rotational motion of triaxially deformed nucleus by using the microscopic framework of angular-momentum projection. The Woods-Saxon potential and the schematic separable-type int…
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Laboratory rotational ground state transitions of NH<sub>3</sub>D<sup>+</sup>and CF<sup>+</sup> Open
Aims. This paper reports accurate laboratory frequencies of the rotational\nground state transitions of two astronomically relevant molecular ions, NH3D+\nand CF+. Methods. Spectra in the millimeter-wave band were recorded by the\nmethod o…
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Laboratory microwave, millimeter wave and far-infrared spectra of dimethyl sulfide Open
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ALMA Observations of Vibrationally Excited HC<sub>3</sub>N Lines Toward Orion KL Open
We present high spatial resolution ALMA observations of vibrational transitions of HC 3 N toward Orion KL in the 214–247 GHz frequency band. 41 transitions of HC 3 N in 7 vibrationally excited states, and 23 transitions of 13 C isotopologu…
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The millimeter-wave spectrum of methyl ketene and the astronomical search for it Open
Context . The analysis of isomeric species of a compound observed in the interstellar medium (ISM) is a useful tool to understand the chemistry of complex organic molecules. It could, likewise, assist in the detection of new species. Aims …
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Rotational Spectroscopy of the NH<sub>3</sub>–H<sub>2</sub> Molecular Complex Open
We report the first high resolution spectroscopic study of the NH 3 –H 2 van der Waals molecular complex. Three different experimental techniques, a molecular beam Fourier transform microwave spectrometer, a millimeter-wave intracavity jet…
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Broad-band high-resolution rotational spectroscopy for laboratory astrophysics Open
We present a new experimental set-up devoted to the study of gas phase molecules and processes using broad-band high spectral resolution rotational spectroscopy. A reactor chamber is equipped with radio receivers similar to those used by r…
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Charmonium transition in electromagnetic and rotational fields Open
We study charmonia in electromagnetic and rotational fields in the frame of a\npotential model. Different from the temperature field which is isotropic and\nleads to the well-known charmonium dissociation, the electromagnetic and\nrotation…
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HIGH PRECISION ROVIBRATIONAL SPECTROSCOPY OF OH<sup>+</sup> Open
The molecular ion OH + has long been known to be an important component of the interstellar medium. Its relative abundance can be used to indirectly measure cosmic ray ionization rates of hydrogen, and it is the first intermediate in the i…