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Title: LABORATORY AND ASTRONOMICAL DISCOVERY OF HYDROMAGNESIUM ISOCYANIDE

We report on the detection of hydromagnesium isocyanide, HMgNC, in the laboratory and in the carbon-rich evolved star IRC+10216. The J = 1-0 and J = 2-1 lines were observed in our microwave laboratory equipment in Valladolid with a spectral accuracy of 3 KHz. The hyperfine structure produced by the nitrogen atom was resolved for both transitions. The derived rotational constants from the laboratory data are B{sub 0} = 5481.4333(6) MHz, D{sub 0} = 2.90(8) KHz, and eQq(N) = –2.200(2) MHz. The predicted frequencies for the rotational transitions of HMgNC in the millimeter domain have an accuracy of 0.2-0.7 MHz. Four rotational lines of this species, J = 8-7, J = 10-9, J = 12-11, and J = 13-12, have been detected toward IRC+10216. The differences between observed and calculated frequencies are <0.5 MHz. The rotational constants derived from space frequencies are B{sub 0} = 5481.49(3) MHz and D{sub 0} = 3.2(1) KHz, i.e., identical to the laboratory ones. A merged fit to the laboratory and space frequencies provides B{sub 0} = 5481.4336(4) MHz and D{sub 0} = 2.94(5) KHz. We have derived a column density for HMgNC of (6 ± 2) × 10{sup 11} cm{sup –2}. From the observedmore » line profiles the molecules have to be produced in the layer where other metal-isocyanides have been already found in this source. The abundance ratio between MgNC and its hydrogenated variety, HMgNC, is ≅20.« less
Authors:
; ; ;  [1] ;  [2] ;  [3] ;  [4]
  1. Grupo de Espectroscopia Molecular (GEM), Laboratorios de Espectroscopia y Bioespectroscopia, Unidad Asociada CSIC, Universidad de Valladolid, E-47005 Valladolid (Spain)
  2. Deparment of Astrophysics, CAB, INTA-CSIC, Crta Torrejón-Ajalvir Km 4, E-28850 Torrejón de Ardoz, Madrid (Spain)
  3. University of Bordeaux, LAB, UMR 5804, F-33270 Floirac, France and CNRS, LAB, UMR 5804, F-33270, Floirac (France)
  4. Institut de Radioastronomie Millimétrique, 300 rue de la Piscine, F-38406 Saint Martin dHéres (France)
Publication Date:
OSTI Identifier:
22270873
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 775; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTRONOMY; ASTROPHYSICS; CARBON STARS; HYDROGENATION; HYPERFINE STRUCTURE; ISOCYANATES; KHZ RANGE; MAGNESIUM COMPOUNDS; MHZ RANGE; MICROWAVE RADIATION; MOLECULES; NITROGEN