Raman spectroscopy on simple molecular systems at very high density

Conference · Fri Jan 01 00:00:00 EST 1988

OSTI ID:7251077

Schiferl, D; LeSar, R S; Moore, D S

We present an overview of how Raman spectroscopy is done on simple molecular substances at high pressures. Raman spectroscopy is one of the most powerful tools for studying these substances. It is often the quickest means to explore changes in crystal and molecular structures, changes in bond strength, and the formation of new chemical species. Raman measurements have been made at pressures up to 200 GPa (2 Mbar). Even more astonishing is the range of temperatures (4-5200/degree/K) achieved in various static and dynamic (shock-wave) pressure experiments. One point we particularly wish to emphasize is the need for a good theoretical understanding to properly interpret and use experimental results. This is particularly true at ultra-high pressures, where strong crystal field effects can be misinterpreted as incipient insulator-metal transitions. We have tried to point out apparatus, techniques, and results that we feel are particularly noteworthy. We have also included some of the /open quotes/oral tradition/close quotes/ of high pressure Raman spectroscopy -- useful little things that rarely or never appear in print. Because this field is rapidly expanding, we discuss a number of exciting new techniques that have been informally communicated to us, especially those that seem to open new possibilities. 58 refs., 18 figs.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 7251077
• Report Number(s): LA-UR-88-1671; CONF-880372-4; ON: DE88010947
• Resource Relation: Conference: NATO advanced study institute on simple molecular systems at very high densities, Les Houches, France, 29 Mar 1988
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
MOLECULES
RAMAN SPECTROSCOPY
CRYSTAL STRUCTURE
DYE LASERS
ELECTRIC FIELDS
HYDROGEN
NITROGEN
PHASE DIAGRAMS
PRESSURE DEPENDENCE
SCATTERING
TEMPERATURE DEPENDENCE
VIBRATIONAL STATES
DIAGRAMS
ELEMENTS
ENERGY LEVELS
EXCITED STATES
LASER SPECTROSCOPY
LASERS
LIQUID LASERS
NONMETALS
SPECTROSCOPY
640302* - Atomic
Molecular & Chemical Physics- Atomic & Molecular Properties & Theory