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You searched on: Author: Francis Lovas

Displaying records 1 to 10 of 159 records.
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1. Microwave Rotational Spectral Study of SO2-CO
Published: 10/2/2015
Authors: Francis John Lovas, Matthew K Sprague
Abstract: The microwave spectrum of the molecular complex of sulfur dioxide (SO2) with carbon monoxide (CO) has been studied with a pulsed-beam Fourier Transform Microwave Spectrometer (FTMW) from a pair of gas samples of 1 % by volume of SO2 and CO in Ar, and ...

2. Microwave Rotational Spectral Study of CH3CN-H2O and Ar-CH3CN
Published: 12/17/2014
Authors: Francis John Lovas, J. Sobhanadrib
Abstract: The microwave spectrum of the molecular complex of acetonitrile (CH3CN) with water (H2O) has been studied with a pulsed-beam Fourier Transform Microwave Spectrometer (FTMW) from a gas sample of 1 % by volume of CH3CN in Ar flowed over a water sample. ...

3. Observational Results of a Multi-Telescope Campaign to Detect Interstellar Urea [(NH2)2CO]
Published: 3/10/2014
Authors: Francis John Lovas, Anthony J. Remijan, Lewis E Snyder, Brett A. McGuire, Hsin-Lun Kuo, Leslie W. Looney, Douglas N Friedel, G. Yu Golbiatnikov, Vadim V. Ilyushin, E A Alekseev, S F Dyubko, Benjamin J. McCall, Jan M. Hollis
Abstract: In this paper, we present observational evidence for gas phase urea observed towards the Sgr B2(N-LMH) region. We show data covering urea transitions from 100 GHz to 250 GHz from five different observational facilities: BIMA, CARMA, the NRAO 12 m tel ...

4. Detection of l-C3H+ in Sgr B2(N) and Sgr B2(OH) and Refinement of its Spectroscopic Constants via the Publicly Available PRIMOS Survey and the Barry E. Turner Legacy Survey
Published: 9/1/2013
Authors: Francis John Lovas, Brett A. McGuire, P. Brandon Carroll, Ryan A. Loomis, Geoffery A. Blake, Jan M. Hollis, Phillip R. Jewell, Anthony J. Remijan
Abstract: Pety et al. (2012) recently reported the detection and assignment of l-C3H+ in the Horsehead nebula. Here, we expand that analysis to include the J = 1 - 0 and J = 2 - 1 transitions of l-C3H+ observed in absorption towards Sgr B2(N) in data from the ...

5. Detection of E-cyanomethanimine (HCN-dimer) towards Sagittarius B2(N) from the GBT PRIMOS Survey
Published: 3/20/2013
Authors: Francis John Lovas, Daniel P. Zaleski, Nathan A. Seifert, Amanda L. Steber, Matt T. Muckle, Ryan A. Loomis, Joanna F. Corby, Oscar Martinez, Kyle Crabtree, Phillip R. Jewell, Jan M. Hollis, David Vasquez, Jolie Nyiramahirwe, Nicole Sciortino, Kennedy Johnson, Michael C. McCarthy, Anthony J. Remijan, Brooks H. Pate
Abstract: An understanding of the formation, distribution and overall excitation of large molecules in astronomical environments remains in question even though more than 170 distinct chemical compounds have been detected in astronomical environments. Further ...

6. The Detection of Interstellar Ethanimine (CH3CHNH) from Observations taken during the GBT PRIMOS Survey
Published: 2/13/2013
Authors: Francis John Lovas, Ryan A. Loomis, Daniel P. Zaleski, Amanda L. Steber, Justin L. Neill, Matthew T. Muckle, Brent J. Harris, Jan M. Hollis, Phillip R. Jewell, Valerio Lattanzi, Oscar Martines, Michael C. McCarthy, Anthony J. Remijan, Brooks H. Pate
Abstract: As the availab¬¬ility of publicly accessible spectral line surveys from radio astronomy increases, new approaches to the identification of molecules in the interstellar medium are possible. We have performed reaction product screening measurements u ...

7. Interstellar Carbodiimide (HNCNH) - A New Astronomical Detection from the GBT PRIMOS Survey via Maser Emission Features
Published: 10/1/2012
Authors: Brett A. McGuire, Ryan A. Loomis, Cameron M. Charness, Geoffery A. Blake, Jan M. Hollis, Francis John Lovas, Philip R. Jewell, Anthony J. Remijan
Abstract: Historically, searches for new astronomical molecules resulted in the detection of favorable, high line strength transitions based on a thermal approximation to the excitation of these species in interstellar environments. Given the temperatures of ...

8. Evolution of Microwave Spectroscopy at the National Bureau of Stansards (NBS) and the National Institute of Standards and Techology (NIST)
Series: Journal of Research (NIST JRES)
Report Number: 117.016
Published: 9/28/2012
Authors: David R. Lide, Richard D. Suenram, Donald R. Johnson, Francis John Lovas
Abstract: This paper describes the beginning and evolution of microwave rotational spectroscopic research starting in 1954 at the National Bureau of Standards (NBS) located at that time in Washington DC. David Lide was hired in 1954 to start this research ...

9. Organic Compounds in the C3H6O3 Family: Microwave Spectrum of cis-cis-Dimethyl Carbonate
Published: 10/18/2010
Authors: Francis John Lovas, David F Plusquellic, Susanna L. Widicus Weaver, B. A. McGuire, G. A. Blake
Abstract: Geometry optimization calculations on 13 members of the C3H6O3 family of organic species have been carried out to determine their relative binding energies. Dimethyl carbonate [(CH3)2CO3] is one of the lower energy species in this family, which inclu ...

10. Detection of Voigt Spectral Line Profiles of Hydrogen Radio Recombination Lines toward Sagittarius B2(N)
Published: 2/24/2010
Authors: Francis John Lovas, Azrael A. von Prochazka, Anthony J. Remijan, Dana S. Balser, Robert S. I. Ryans, Adele H. Marshall, Frederic R. Schwab, Jan M. Hollis, Phil R. Jewell
Abstract: We report the detection of Voigt spectral line profiles of radio recombination lines (RRLs) toward Sagittarius B2(N) with the 100-m Green Bank Telescope (GBT). These results constitute the first known, unambiguous detection of the Voigt spectral line ...

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