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J/ApJ/723/845   The submillimeter spectrum of glycolaldehyde    (Carroll+, 2010)

The submillimeter spectrum of glycolaldehyde. Carroll P.B., Drouin B.J., Widicus Weaver S.L. <Astrophys. J., 723, 845-849 (2010)> =2010ApJ...723..845C
ADC_Keywords: Interstellar medium ; Spectra, millimetric/submm ; Atomic physics Keywords: ISM: molecules - line: identification - methods: data analysis - methods: laboratory - molecular data - molecular processes - radio lines: ISM Abstract: Glycolaldehyde (HOCH2CHO) is a sugar-related interstellar prebiotic molecule that has been detected in two star-forming regions, Sgr B2(N) and G31.41+0.31. Glycolaldehyde is suspected to form from photodissociation-driven ice chemistry, and therefore can be used to trace complex organic chemistry in interstellar environments. The relative abundance of glycolaldehyde to its structural isomers, methyl formate (HCOOCH3) and acetic acid (CH3COOH), can be used to constrain astrochemical models. Given its central role in the complex chemistry of the interstellar medium, glycolaldehyde has been suggested as a prime molecular target for upcoming high-frequency molecular line searches using new far-infrared observatories. In particular, glycolaldehyde is a target for the Herschel Space Observatory HEXOS Key Program, which is conducting spectral line surveys of the Sgr B2(N) and Orion KL star-forming regions across the entire HIFI band. Laboratory investigation of glycolaldehyde in the HIFI frequency range is required before its lines can be identified in these spectra. We have therefore acquired the laboratory spectrum of glycolaldehyde in selected frequency ranges across the submillimeter range. We present here the laboratory spectral analysis of the ground vibrational state of glycolaldehyde up to 1.2THz. Description: Spectra were taken in three windows between 520 and 608GHz, 800 and 900GHz, and 1.07 and 1.2THz. In all cases, the spectra were acquired using a 99% pure glycolaldehyde sample from Sigma-Aldrich. The 520-608GHz and 1.07-1.2THz spectra were obtained at the Jet Propulsion Laboratory (JPL) molecular spectroscopy lab. The 800-900GHz spectra were obtained at Emory University using a single-pass direct absorption flow-cell spectrometer. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 55 1412 Assigned transitions for the the ground vibrational state of glycolaldehyde
See also: J/A+A/540/A51 : Submm spectrum of deuterated glycolaldehydes (Bouchez+, 2012) J/ApJS/158/188 : Detection of glycolaldehyde toward Sgr B2 (Widicus+, 2005) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 2 I2 --- J' [1/63] Upper J level 4- 5 I2 --- Ka' [0/32] Upper Ka level 7- 8 I2 --- Kc' [0/60] Upper Kc level 10- 11 I2 --- J" [0/62] Lower J level 13- 14 I2 --- Ka" [0/31] Lower Ka level 16- 17 I2 --- Kc" [0/59] Lower Kc level 19- 30 F12.4 MHz Freq Frequency observed 31 A1 --- --- [0] 33- 40 F8.5 MHz O-C Observed - Calculated frequency 42- 48 F7.5 MHz e_Freq [0.1] Uncertainty in Freq 50- 55 F6.4 --- Int ? Intensity weighting for blended lines
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 18-Jul-2012
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