Picture of Rachel

Rachel M. E. Mastrapa


NASA Ames Research Center
Attn: Rachel Mastrapa
Mail Stop 245-6 (Bldg N245, Room 261)
Moffett Field CA 94035
Office: Building N245
Phone: (650) 604-3335
FAX: (650) 604-6779
E-Mail: Rachel.M.Mastrapa@nasa.gov
Web: http://rossbeyer.net/~mastrapa/

Rachel is currently a Research Scientist at SETI , working at the NASA Ames Research Center with the Astrochemistry Group .

Rachel studies the surface processes of icy Solar System bodies by interpreting their infrared spectra. The majority of her work involves performing the ground truth measurements in the laboratory including calculating the complex indices of refraction of single composition ice samples. These measurements are then used to construct model spectra to interpret the chemical composition of observed spectra. She also studies the subtle changes seen in ice mixtures that are not seen in single composition samples. She has helped measure the surface binding energy of the CH4-H2O-ice system, which can be used to measure the residence time of CH4 on H2O-ice rich surfaces. Finally, she has measured how proton irradiation can change the phase of H2O-ice from crystalline phase to amorphous phase. Rachel has collaborated with her peers to collect spectra of Europa from the Keck Observatory and interpret Cassini VIMS spectra of Enceladus.

Download my cv.

With Ames since: 2005; With SETI since: 2007

Current Projects:

Past Projects:

Selected Memberships/Committee Positions:

Recent Publications:

Mastrapa, R. M., et al (2009) "Optical Constants of Amorphous and Crystalline H2O-ice: 2.5-22 μm (4000-455 cm-1)." Astrophysical Journal 701: 1347-1356. DOI: 10.1088/0004-637X/701/2/1347 Manuscript and data

Mastrapa, R. M., et al (2008) “Optical constants of amorphous and crystalline H2O-ice in the near infrared from 1.1 to 2.6 μm” Icarus. 197, DOI: 10.1016/j.icarus.2008.04.008 307-320. Manuscript and data PDS data

Brown, R. H., R. N. Clark, et al. (2006). “Composition and Physical Properties of Enceladus’ Surface from Cassini’s Visual and Infrared Mapping Spectrometer.” Science. 311: 1425-1428. PDF

Mastrapa, R. M. E. and R. H. Brown (2006). "Ion Irradiation of Crystalline H2O-ice: Effect on the 1.65 μm feature." Icarus 183: 207-214. PDF

My dissertation in pdf and postscript format.