Deep Ultraviolet Pre-Resonance Raman Scatter of Ice and Its Implications for Climate Research
Document ID: 335
Neely, III, Ryan R.1
Chadwick, Christopher Todd1
Willitsford, Adam H.2
Philbrick, C. Russell2
Hallen, Hans D.1
Presentation
1 North Carolina State University, Department of Physics, Raleigh, NC, U.S.A.
2 The Pennsylvania State University, Department of Electrical and Computer Engineering, University Park, PA, U.S.A.
Abstract
The Raman scattering of ice has been investigated near the first deep ultraviolet electronic absorption. As the excitation beam approached the absorption band of water, significant enhancement in the Raman signal was observed. After normalizing for the non-resonant dipole absorption/radiation effects and input laser power, the integrated intensities of the Raman spectra for excitation energies ranging from 2.9eV to 5.6eV were compared. The A term of the Raman scattering tensor, which describes the pre-resonant enhancement of the spectra, models the observed intensities as a function of incident beam energy. These findings suggest that application of pre-resonant or resonant Raman LIDAR could vastly improve spatial and temporal resolution of water vapor measurements in clouds.