Results 31 to 40 of about 167,062 (317)

From the laboratory to the interstellar medium: a strategy to search for exotic molecules in space

Frontiers in Astronomy and Space Sciences, 2023
The chemistry of the interstellar medium occurs under extreme conditions and can lead to the formation of exotic molecules. These are species that on Earth are unstable and/or highly reactive. Their discovery in space is usually based on the astronomical
Cristina Puzzarini, Silvia Alessandrini, Luca Bizzocchi, Mattia Melosso, Víctor M. Rivilla   +4 more
doaj   +1 more source

QED effects in molecules: test on rotational quantum states of H$_2$ [PDF]

, 2011
Quantum electrodynamic effects have been systematically tested in the progression of rotational quantum states in the $X ^{1}\Sigma_{g}^{+}, v=0$ vibronic ground state of molecular hydrogen. High-precision Doppler-free spectroscopy of the $EF ^{1}\Sigma_{
Dickenson, G. D., Ivanov, T. I., Salumbides, E. J., Ubachs, W.   +3 more
core   +3 more sources

Terahertz Rotational Spectroscopy [PDF]

Proceedings of the International Astronomical Union, 2005
The detection of interstellar molecules relies on the precise knowledge of spectral line positions from laboratory measurements. Technical developments of recent years have led to an extension of the accessible spectral range towards shorter wavelengths. New telescopes like SOFIA, the HIFI instrument aboard the Herschel satellite, and ALMA will be used
T. F. Giesen, S. Brünken, M. Caris, P. Neubauer-Guenther, U. Fuchs, G. W. Fuchs, F. Lewen   +6 more
openaire   +1 more source

Potential-energy surfaces, unimolecular processes and spectroscopy [PDF]

, 1988
The present symposium brings together research in a number of fields: the quantum-chemical calculation of molecular potential-energy surfaces, rotational–vibrational spectroscopy, methods of calculating rotational–vibrational energy levels, unimolecular ...
Marcus, Rudolph A.
core   +1 more source

Pure Rotational Spectrum of Benzophenone Detected by Broadband Microwave Spectrometer in the 2–8 GHz Range

Applied Sciences, 2020
The investigation on microwave spectrum of benzophenone was conducted with a recently constructed broadband chirped-pulse Fourier transform microwave spectrometer with a heating nozzle in the 2–8 GHz range.
Haoyang Tan, Miaoling Yang, Chenbo Huang, Shengwen Duan, Ming Sun, Qian Chen, Chao Jiao, Yi Wu   +7 more
doaj   +1 more source

Laboratory Measurement of the Pure Rotational Transitions of the HCNH+ and its Isotopic Species [PDF]

, 1998
The pure rotational transitions of the protonated hydrogen cyanide ion, HCNH+, and its isotopic species, HCND+ and DCND+, were measured in the 107 - 482 GHz region with a source modulated microwave spectrometer. The ions were generated in the cell with a
Godfrey P. D., Guelin M., H. Ozeki, Hasegawa T. I., Herbst E., Howe D. A., M. Araki, S. Saito, Schilke P., Schilke P., Talbi D.   +10 more
core   +2 more sources

Methyl Internal Rotation in Fruit Esters: Chain-Length Effect Observed in the Microwave Spectrum of Methyl Hexanoate

Molecules, 2022
The gas-phase structures of the fruit ester methyl hexanoate, CH3-O-(C=O)-C5H11, have been determined using a combination of molecular jet Fourier-transform microwave spectroscopy and quantum chemistry.
Nhu-Ngoc Dang, Hoang-Nam Pham, Isabelle Kleiner, Martin Schwell, Jens-Uwe Grabow, Ha Vinh Lam Nguyen   +5 more
doaj   +1 more source

Terahertz Rotational Spectroscopy of Greenhouse Gases Using Long Interaction Path-Lengths

Applied Sciences, 2021
Even if on-board mm-wave/THz heterodyne receivers have been developed to measure greenhouse gases (GHGs) atmospheric profiles, rotational spectroscopy rests under-exploited for their monitoring unlike IR rovibrational spectroscopy.
Arnaud Cuisset, Francis Hindle, Gaël Mouret, Robin Bocquet, Jonas Bruckhuisen, Jean Decker, Anastasiia Pienkina, Cédric Bray, Éric Fertein, Vincent Boudon   +9 more
doaj   +1 more source

Helium nanodroplet isolation ro-vibrational spectroscopy: methods and recent results [PDF]

, 2001
In this article, recent developments in HElium NanoDroplet Isolation (HENDI) spectroscopy are reviewed, with an emphasis on the infrared region of the spectrum.
Abraham, Andersen, Andronikashvili, Babichenko, Barranco, Behrens, Behrens, Behrens, Blume, Blume, Brink, Buchenau, Busani, Callegari, Callegari, Callegari, Capasso, Carlo Callegari, Ceperley, Chang, Chin, Colombelli, Conjusteau, Dalfovo, Dalfovo, Dalfovo, de Broglie, Diederich, Douketis, Dupont-Roc, Eichenauer, Even, Farnik, Friedrich, Fröchtenicht, Fröchtenicht, Giacinto Scoles, Gough, Gough, Gough, Goyal, Goyal, Grebenev, Grebenev, Grebenev, Grebenev, Grebenev, Grebenev, Grevenev, Gspann, Guardiola, Harms, Harms, Harms, Harms, Harms, Harms, Harms, Hartmann, Hartmann, Hartmann, Hartmann, Higgins, Higgins, Hu, Huisken, Huisken, Hutson, Jortner, Kevin K. Lehmann, Klots, Knuth, Kohn, Kunze, Kwon, Kwon, Kwon, Lawerenz, Lee, Leggett, Lehmann, Lehmann, Lehmann, Lehmann, Lindinger, Loesch, Madelung, Maki, Manousakis, Moore, Moore, Nauta, Nauta, Nauta, Nauta, Nauta, Nauta, Nauta, Nauta, Nauta, Nauta, Nauta, Nauta, Nesbitt, Northby, Oka, Ortiz, Pi, Powers, Reho, Reinhard, Roman Schmied, Schöllkopf, Smith, Stephens, Stewart, Stienkemeier, Stienkemeier, Szalewicz, Tabbert, Tam, Toennies, Toennies, Toennies   +123 more
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Protonation of apolar species: From Cl2H+ to (E)-NCCHCHCNH+ through computational investigations

Frontiers in Astronomy and Space Sciences, 2023
Radioastronomy is a powerful tool for the discovery of molecules in space but it requires molecular species to be polar. The observation of apolar species can be however enabled by protonation, which occurs from reaction with the abundant H3+ ion ...
Silvia Alessandrini, Luca Bizzocchi, Mattia Melosso, Cristina Puzzarini   +3 more
doaj   +1 more source