TERAHERTZ SPECTROSCOPY OF THE BENDING VIBRATIONS OF ACETYLENE {sup 12}C{sub 2}H{sub 2}

Journal Article · Sun Nov 01 00:00:00 EDT 2009 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/705/1/786· OSTI ID:21378344

Shanshan, Yu; Drouin, Brian J

Twenty P-branch transitions of {sup 12}C{sub 2}H{sub 2} have been measured in the 0.8-1.6 THz region of its bending vibrational difference band. The accuracy of these measurements is estimated to be 100 kHz. The {sup 12}C{sub 2}H{sub 2} molecules were generated under room temperature by passing 150 mTorr H{sub 2}O vapor through calcium carbide (CaC{sub 2}) powder. The observed transitions were modeled together with prior far-infrared data involving the bending levels with SIGMA{sub t}V{sub t} (t = 4,5)<=2. Frequency predictions of {sup 12}C{sub 2}H{sub 2} in the terahertz region have been greatly improved by adding the first data of 'microwave' precision. The new measurements and predictions reported here will facilitate the analyses of astronomical observations by the high spectral resolution telescopes such as Herschel, SOFIA, and ALMA.

• OSTI ID: 21378344
• Journal Information: Astrophysical Journal, Vol. 705, Issue 1; Other Information: DOI: 10.1088/0004-637X/705/1/786; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ACETYLENE
CALCIUM CARBIDES
CARBON 12
KHZ RANGE 01-100
POWDERS
SPECTROSCOPY
TELESCOPES
TEMPERATURE RANGE 0273-0400 K
THZ RANGE
WATER VAPOR
ALKALINE EARTH METAL COMPOUNDS
ALKYNES
CALCIUM COMPOUNDS
CARBIDES
CARBON COMPOUNDS
CARBON ISOTOPES
EVEN-EVEN NUCLEI
FLUIDS
FREQUENCY RANGE
GASES
HYDROCARBONS
ISOTOPES
KHZ RANGE
LIGHT NUCLEI
NUCLEI
ORGANIC COMPOUNDS
STABLE ISOTOPES
TEMPERATURE RANGE
VAPORS