# FREQUENCY COMB-REFERENCED MEASUREMENTS OF SELF- AND NITROGEN-PERTURBED LINE SHAPES IN THE $\nu_1$ + $\nu_3$ BAND OF ACETYLENE

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/49462

Files Size Format View
abstract.gif 88.67Kb GIF image
TE06MatthewCichOhio2011.ppt 2.127Mb Microsoft PowerPoint View/Open
Slide1.GIF 37.18Kb GIF image
Slide2.GIF 148.2Kb GIF image
Slide3.GIF 35.54Kb GIF image
Slide4.GIF 29.46Kb GIF image
Slide5.GIF 22.67Kb GIF image
Slide6.GIF 36.57Kb GIF image
Slide7.GIF 27.77Kb GIF image
Slide8.GIF 67.48Kb GIF image
Slide9.GIF 58.76Kb GIF image
Slide10.GIF 27.78Kb GIF image
Slide11.GIF 74.09Kb GIF image
Slide12.GIF 24.02Kb GIF image

 Title: FREQUENCY COMB-REFERENCED MEASUREMENTS OF SELF- AND NITROGEN-PERTURBED LINE SHAPES IN THE $\nu_1$ + $\nu_3$ BAND OF ACETYLENE Creators: Cich, Matthew J.; Lopez, Gary V.; Sears, Trevor J.; McRaven, C. P.; Mantz, A. W.; Hurtmans, Daniel Issue Date: 2011 Publisher: Ohio State University Abstract: Frequency comb technology has the potential to dramatically improve precision and accuracy in measured spectra, but few applications have yet been reported. One application that can benefit from the high stability of spectrometers referenced to frequency combs is the measurement of spectral line shapes. We have built an absorption spectrometer based on an extended cavity diode laser locked to an Er-fiber-based frequency comb operating near 1550 nm. Here we report the first measurements of line shapes using a frequency comb as a reference. We studied the P(11) line in the $\nu_1$ + $\nu_3$ combination band of acetylene at 195 739.649 513(8) GHz at several temperatures from 296K down to 175K. This talk focuses on the data taken at 296K. We used a hard collision model (Rautian-Sobel'man) fit to the measurements to determine self- and nitrogen- pressure broadening, pressure shift and Dicke narrowing parameters that are at least 2 orders of magnitude more precise than those reported in previous measurements. We compare these hard collision model results with those of two other widely-used models: the Galatry (soft collision) and the Voigt function. The temperature- and rotational level- dependence of these parameters have been measured and some of the results will be discussed in a separate talk. Acknowledgements:Acknowledgement is made to the Donors of the American Chemical Society Petroleum Research Fund for partial support of this research. CPM gratefully acknowledges support by DOE EPSCoR grant DOE-07ER46361 for work conducted at the University of Oklahoma. The measurements and analyses were performed under grants NNX09AJ93G and NNX08AO78G from the NASA Planetary and Atmospheres program. Description: Author Institution: Department of Chemistry, Stony Brook University, Stony Brook, New York 11794; Department of Chemistry, Brookhaven National Laboratory, Upton, New York 11973; Department of Physics, Astronomy, and Astrophysics, Connecticut College, New London, CT 06320; Service de Chimie Quantique et de Photophysique(Atoms, Molecules et Atmospheres), Universite Libre de Bruxelles, Bruxelles, Belgium B-10050 URI: http://hdl.handle.net/1811/49462 Other Identifiers: 2011-TE-06