Lowest bending mode of 13C-substituted C3 and an experimentally derived structure

Breier, Alexander A.; Büchling, Thomas; Schnierer, Rico; Lutter, V.; Fuchs, Guido W.; Yamada, Kōichi; Mookerjea, B.; Stützki, J.; Giesen, Thomas

doi:10.1063/1.4971854

Cited by 20 publications

(30 citation statements)

References 29 publications

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“…In addition to the impact of our findings on quantum chemistry, nuclear structure and fundamental physics research, the ability to produce, mass-select and spectroscopically study short-lived radioactive molecules is of importance to other fields of research such as radiochemistry 21 and astrophysics 39,40 . Laboratory measurements of the spectra of radioactive molecules of astrophysical interest will allow their unambiguous identification in future astronomical observations.…”

Section: Articlementioning

confidence: 99%

Spectroscopy of short-lived radioactive molecules

Ruiz

Berger

Billowes

et al. 2020

Nature

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112

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Molecular spectroscopy offers opportunities for the exploration of the fundamental laws of nature and the search for new particle physics beyond the standard model1–4. Radioactive molecules—in which one or more of the atoms possesses a radioactive nucleus—can contain heavy and deformed nuclei, offering high sensitivity for investigating parity- and time-reversal-violation effects5,6. Radium monofluoride, RaF, is of particular interest because it is predicted to have an electronic structure appropriate for laser cooling6, thus paving the way for its use in high-precision spectroscopic studies. Furthermore, the effects of symmetry-violating nuclear moments are strongly enhanced5,7–9 in molecules containing octupole-deformed radium isotopes10,11. However, the study of RaF has been impeded by the lack of stable isotopes of radium. Here we present an experimental approach to studying short-lived radioactive molecules, which allows us to measure molecules with lifetimes of just tens of milliseconds. Energetically low-lying electronic states were measured for different isotopically pure RaF molecules using collinear resonance ionisation at the ISOLDE ion-beam facility at CERN. Our results provide evidence of the existence of a suitable laser-cooling scheme for these molecules and represent a key step towards high-precision studies in these systems. Our findings will enable further studies of short-lived radioactive molecules for fundamental physics research.

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Section: Articlementioning

confidence: 99%

Spectroscopy of short-lived radioactive molecules

Ruiz

Berger

Billowes

et al. 2020

Nature

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112

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“…Despite its perceived stability, in retrospect it is remarkable that its optical and rotational spectrum eluded detection until quite recently. In fact, SiCSi is the last of the four Si m C n , m + n = 3 isovalent clusters whose ground state structure and bonding was determined by experiment; by comparison, those of C 3 ,43–47 SiC 2 ,48,49 and Si 3 50 were all reported at high spectral resolution more than a decade ago.…”

Section: Disilicon Carbide Sicsi a Possible Progenitor For Dustmentioning

confidence: 99%

Building Blocks of Dust and Large Organic Molecules: A Coordinated Laboratory and Astronomical Study of Agb Stars

McCarthy¹,

Gottlieb²,

Cernicharo³

2017

Proceedings of the 72nd International Symposium on Molecular Spectroscopy

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This article provides an overview of recent astronomical studies and a closely coordinated laboratory program devoted to the study of the physics and chemistry of carbon rich Asymptotic Giant Branch (AGB) stars. The increased sensitivity and angular resolution of high altitude ground-based millimeter-wave interferometers in the past few years has enabled molecular astronomers to determine the excitation and spatial distribution of molecules within a few stellar radii of the central star where the molecular seeds of dust are formed, and to critically assess the physicochemical mechanisms of dust formation and growth. However the astronomical studies are crucially dependent on precise laboratory measurements of the rotational spectra — both in the ground and vibrationally excited states of the normal and rare isotopic species — of the principal molecules in the inner region which appear to contain only two or three heavy atoms Much remains to be done by laboratory spectroscopists as evidenced by the large number of unassigned millimeters-wave rotational lines that are observed in the inner envelope of carbon rich AGB stars. As an illustration we refer to the example of an initial laboratory approach for establishing whether vibrationally excited SiC2 and HCN are the carriers of some of the unassigned features observed in the prototypical carbon rich AGB star IRC+10216 with ALMA. Also highlighted are ongoing laboratory studies of the silicon carbides SiC2 and SiCSi in their ground and excited vibrational states, and SiC3 in the ground vibrational state. Following the initial detection of SiC3 and SiCSi in the outer molecular envelope of IRC+10216, the laboratory spectroscopy was extended to higher frequency in support of the recent interferometric measurements. Thirty-two new millimeter-wave rotational transitions of SiCSi with J ≤ 48, Ka ≤ 3 and upper level energies Eu ≤ 484 K in the range from 178 – 391 GHz, and 35 new transitions of SiC3 with J ≤ 38, Ka ≤ 20 and Eu ≤ 875 K between 315 and 440 GHz were measured in the laboratory. In addition five to six rotational transitions in one quanta of each of the three fundamental vibrational modes of SiCSi, and the two lowest rotational transitions in the previously unexplored C–C stretching mode (ν1) of SiCC were measured in the normal and doubly substituted 13C isotopic species.

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“…The experimental setup has been described in Ref. [36].…”

Section: Methodsmentioning

confidence: 99%

Mass-independent analysis of the stable isotopologues of gas-phase titanium monoxide – TiO

Breier

Waßmuth

Fuchs

et al. 2019

Journal of Molecular Spectroscopy

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More than 130 pure rotational transitions of 46 TiO, 47 TiO, 48 TiO, 49 TiO, 50 TiO, and 48 Ti 18 O are recorded using a high-resolution mm-wave supersonic jet spectrometer in combination with a laser ablation source. For the first time a mass-independent Dunham-like analysis is performed encompassing rare titanium monoxide isotopologues, and are compared to results from high-accuracy quantum-chemical calculations. The obtained parametrization reveals for titanium monoxide effects due to deviations from the Born-Oppenheimer approximation. Additionally, the dominant titanium properties enable an insight into the electronic structure of TiO by analyzing its hyperfine interactions. Further, based on the mass-independent analysis, the frequency positions of the pure rotational transitions of the short lived rare isotopologue 44 TiO are predicted with high accuracy, i.e., on a sub-MHz uncertainty level. This allows for dedicated radio-astronomical searches of this species in core-collapse environments of supernovae.

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Lowest bending mode of 13C-substituted C3 and an experimentally derived structure

Cited by 20 publications

References 29 publications

Spectroscopy of short-lived radioactive molecules

Spectroscopy of short-lived radioactive molecules

Building Blocks of Dust and Large Organic Molecules: A Coordinated Laboratory and Astronomical Study of Agb Stars

Mass-independent analysis of the stable isotopologues of gas-phase titanium monoxide – TiO

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