Interpreting Methanol v2-band Emission in Comets using Empirical Fluorescence g-factors

Details Interpreting Methanol v2-band Emission in Comets using Empirical Fluorescence g-factors Interpreting Methanol v2-band Emission in Comets using Empirical Fluorescence g-factors

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1242d&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1242

Computer Science

Scientific paper

The present study concentrates on the spectral region from ~ 2970 - 3010 cm-1 (3.367 - 3.322 μm), which is dominated by emission in the ν7 band of C2H6 and the ν2 band of CH3OH, with minor contributions from CH3OH (ν9 band), CH4 (ν3), and OH prompt emissions (ν1 and ν2 - ν1). Based on laboratory jetcooled spectra (at a rotational temperature near 20 K)[1], we incorporated approximately 100 lines of the CH3OH ν2 band, having known frequencies and lower state rotational energies, into our model. Line intensities were determined through comparison with several comets we observed with NIRSPEC at Keck 2, after removal of continuum and additional molecular emissions and correcting for atmospheric extinction. In addition to the above spectral region, NIRSPEC allows simultaneous sampling of the CH3OH ν3 band (centered at 2844 cm-1, or 3.516 μm) and several hot bands of H2O in the ~ 2.85 - 2.9 μm region, at a nominal spectral resolving power of ~ 25,000 [2]. Empirical g-factors for ν2 lines were based on the production rate as determined from the ν3 Q-branch intensity; application to comets spanning a range of rotational temperatures (~ 50 - 90 K) will be reported. This work represents an extension of that presented for comet 21P/Giacobini-Zinner at the 2010 Division for Planetary Sciences meeting [3]. Our empirical study also allows for quantifying CH3OH in comets using IR spectrometers for which the ν3 and ν2 bands are not sampled simultaneously, for example CSHELL / NASA-IRTF or CRIRES / VLT.

Affiliated with

Also associated with

No associations

Rating

Interpreting Methanol v2-band Emission in Comets using Empirical Fluorescence g-factors does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Interpreting Methanol v2-band Emission in Comets using Empirical Fluorescence g-factors, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Interpreting Methanol v2-band Emission in Comets using Empirical Fluorescence g-factors will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1483374