Vibrational Relaxation and Vibrational Cooling in Molecular Crystals

The processes of vibrational relaxation (VR) and vibrational cooling (VC) are investigated both experimentally and theoretically in low temperature crystals of complex molecules, specifically benzene, naphthalene, anthracene and durene. In addition to ps CARS data previously obtained on these pure crystals, the VR of dilute impurity molecules (naphthalene, anthracene) in crystalline host matrices (durene, naphthalene) is studied with the ps photon echo technique. The results obtained by echoes on vibrations in the electronically excited state are compared to previous ps time delayed coherent Raman studies of ground state vibrations of the pure host matrix. The relaxation channels for guest and host, and the effects of molecular and crystal structure on VR rates are determined.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Chemistry

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2014

Author dc:creator

• Hill, Jeffrey Richard

• Chemistry, Physical

Identifier

(UMI)AAI8908707

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/70423