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Prajapati D, Vinodkumar PC, Limbachiya C, Vinodkumar M. Theoretical investigations of structural, spectroscopic and electron collision data of acetone. Mol Phys 2021. [DOI: 10.1080/00268976.2021.1948124] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- D. Prajapati
- Department of Physics, Sardar Patel University, Vallabh Vidyanagar, India
- Shree M R Arts & Science College, Rajpipla, India
| | - P. C. Vinodkumar
- Department of Physics, Sardar Patel University, Vallabh Vidyanagar, India
| | - C. Limbachiya
- Department of Applied Physics, The M. S. University of Baroda, Vadodara, India
| | - M. Vinodkumar
- Electronics Department, V.P. & R.P.T.P. Science College, Vallabh Vidyanagar, India
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2
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Taylor MGGT, Altobelli N, Buratti BJ, Choukroun M. The Rosetta mission orbiter science overview: the comet phase. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2017; 375:rsta.2016.0262. [PMID: 28554981 PMCID: PMC5454230 DOI: 10.1098/rsta.2016.0262] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 03/07/2017] [Indexed: 05/11/2023]
Abstract
The international Rosetta mission was launched in 2004 and consists of the orbiter spacecraft Rosetta and the lander Philae. The aim of the mission is to map the comet 67P/Churyumov-Gerasimenko by remote sensing, and to examine its environment in situ and its evolution in the inner Solar System. Rosetta was the first spacecraft to rendezvous with and orbit a comet, accompanying it as it passes through the inner Solar System, and to deploy a lander, Philae, and perform in situ science on the comet's surface. The primary goals of the mission were to: characterize the comet's nucleus; examine the chemical, mineralogical and isotopic composition of volatiles and refractories; examine the physical properties and interrelation of volatiles and refractories in a cometary nucleus; study the development of cometary activity and the processes in the surface layer of the nucleus and in the coma; detail the origin of comets, the relationship between cometary and interstellar material and the implications for the origin of the Solar System; and characterize asteroids 2867 Steins and 21 Lutetia. This paper presents a summary of mission operations and science, focusing on the Rosetta orbiter component of the mission during its comet phase, from early 2014 up to September 2016.This article is part of the themed issue 'Cometary science after Rosetta'.
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Affiliation(s)
| | - N Altobelli
- ESA/ESAC, 28692 Villanueva de la Cañada, Spain
| | - B J Buratti
- JPL/California Institute of Technology, Pasadena, CA 91109, USA
| | - M Choukroun
- JPL/California Institute of Technology, Pasadena, CA 91109, USA
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Wright IP, Sheridan S, Morgan GH, Barber SJ, Morse AD. On the attempts to measure water (and other volatiles) directly at the surface of a comet. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2017; 375:rsta.2015.0385. [PMID: 28416724 PMCID: PMC5394252 DOI: 10.1098/rsta.2015.0385] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 12/14/2016] [Indexed: 05/23/2023]
Abstract
The Ptolemy instrument on the Philae lander (of the Rosetta space mission) was able to make measurements of the major volatiles, water, carbon monoxide and carbon dioxide, directly at the surface of comet 67P/Churyumov-Gerasimenko. We give some background to the mission and highlight those instruments that have already given insights into the notion of water in comets, and which will continue to do so as more results are either acquired or more fully interpreted. On the basis of our results, we show how comets may in fact be heterogeneous over their surface, and how surface measurements can be used in a quest to comprehend the daily cycles of processes that affect the evolution of comets.This article is part of the themed issue 'The origin, history and role of water in the evolution of the inner Solar System'.
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Affiliation(s)
- I P Wright
- Department of Physical Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK
| | - S Sheridan
- Department of Physical Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK
| | - G H Morgan
- Department of Physical Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK
| | - S J Barber
- Department of Physical Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK
| | - A D Morse
- Department of Physical Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK
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Dalbouha S, Senent ML, Komiha N, Domínguez-Gómez R. Structural and spectroscopic characterization of methyl isocyanate, methyl cyanate, methyl fulminate, and acetonitrile N-oxide using highly correlated ab initio methods. J Chem Phys 2017; 145:124309. [PMID: 27782665 DOI: 10.1063/1.4963186] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Various astrophysical relevant molecules obeying the empirical formula C2H3NO are characterized using explicitly correlated coupled cluster methods (CCSD(T)-F12). Rotational and rovibrational parameters are provided for four isomers: methyl isocyanate (CH3NCO), methyl cyanate (CH3OCN), methyl fulminate (CH3ONC), and acetonitrile N-oxide (CH3CNO). A CH3CON transition state is inspected. A variational procedure is employed to explore the far infrared region because some species present non-rigidity. Second order perturbation theory is used for the determination of anharmonic frequencies, rovibrational constants, and to predict Fermi resonances. Three species, methyl cyanate, methyl fulminate, and CH3CON, show a unique methyl torsion hindered by energy barriers. In methyl isocyanate, the methyl group barrier is so low that the internal top can be considered a free rotor. On the other hand, acetonitrile N-oxide presents a linear skeleton, C3v symmetry, and free internal rotation. Its equilibrium geometry depends strongly on electron correlation. The remaining isomers present a bend skeleton. Divergences between theoretical rotational constants and previous parameters fitted from observed lines for methyl isocyanate are discussed on the basis of the relevant rovibrational interaction and the quasi-linearity of the molecular skeleton.
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Affiliation(s)
- S Dalbouha
- Departamento de Química y Física Teóricas, Instituto de Estructura de la Materia, IEM-CSIC, Serrano 121, Madrid 28006, Spain
| | - M L Senent
- Departamento de Química y Física Teóricas, Instituto de Estructura de la Materia, IEM-CSIC, Serrano 121, Madrid 28006, Spain
| | - N Komiha
- LS3ME-Equipe de chimie théorique et Modélisation, Faculté des Sciences Rabat-Université Mohammed V, 4 Avenue Ibn Battouta B.P. 1014 RP, Rabat, Morocco
| | - R Domínguez-Gómez
- E.T.S. de Ingeniería Civil, Universidad Politécnica de Madrid, Alfonso XII, 3-5, Madrid 28014, Spain
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Olah GA, Mathew T, Prakash GKS. Chemical Formation of Methanol and Hydrocarbon (“Organic”) Derivatives from CO2 and H2—Carbon Sources for Subsequent Biological Cell Evolution and Life’s Origin. J Am Chem Soc 2016; 139:566-570. [DOI: 10.1021/jacs.6b10230] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- George A. Olah
- Loker Hydrocarbon Research
Institute and Department of Chemistry, University of Southern California, Los Angeles, California 90089-1661, United States
| | - Thomas Mathew
- Loker Hydrocarbon Research
Institute and Department of Chemistry, University of Southern California, Los Angeles, California 90089-1661, United States
| | - G. K. Surya Prakash
- Loker Hydrocarbon Research
Institute and Department of Chemistry, University of Southern California, Los Angeles, California 90089-1661, United States
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Olah GA, Mathew T, Prakash GKS, Rasul G. Chemical Aspects of Astrophysically Observed Extraterrestrial Methanol, Hydrocarbon Derivatives, and Ions. J Am Chem Soc 2016; 138:1717-22. [DOI: 10.1021/jacs.6b00343] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- George A. Olah
- Loker Hydrocarbon Research
Institute and Department of Chemistry, University of Southern California, Los Angeles, California 90089-1661, United States
| | - Thomas Mathew
- Loker Hydrocarbon Research
Institute and Department of Chemistry, University of Southern California, Los Angeles, California 90089-1661, United States
| | - G. K. Surya Prakash
- Loker Hydrocarbon Research
Institute and Department of Chemistry, University of Southern California, Los Angeles, California 90089-1661, United States
| | - Golam Rasul
- Loker Hydrocarbon Research
Institute and Department of Chemistry, University of Southern California, Los Angeles, California 90089-1661, United States
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