Parts | Days | Selection | Search | Downloads | Help

SYHR: High resolution spectroscopy – modern trends and new techniques

SYHR 1: High resolution spectroscopy - modern trends and new techniques I

SYHR 1.1: Invited Talk

Thursday, March 5, 2009, 10:30–11:10, VMP 8 R05

High-Resolution Rotational Spectroscopy: New Waves — •Jens-Uwe Grabow — Gottfried-Wilhelm-Leibniz-Universität, Institut für Physikalische Chemie & Elektrochemie, Lehrgebiet A, Callinstrasse 3A, 30167 Hannover

Small particles, larger molecules and clusters are of increasing technological importance with numerous fundamental questions on their structure and dynamical behavior waiting to be answered. Targeted by high resolution spectroscopy they impose a number of challenges, theoretically and experimentally.

From the theoretical point of view, e.g., internal large amplitude motions result in complicated energy level schemes. For larger species exhibiting multiple internal motions at low barriers, the resulting spectra will be rather difficult to predict. From an experimental point of view, dense spectra at the presence of wide splitting patterns are difficult to assign. With narrow-banded techniques, even though very sensitive, identification of the spectral features becomes a paramount task.

Quantitative information on the structure, charge distribution, characterization of the chemical bond, details on internal dynamics, etc. - at the highest precision available to date - are encoded in pure rotational spectra obtained by microwave spectroscopy. Right now - about a quarter century after the introduction of supersonic-jet resonator Fourier-transform microwave spectroscopy - new exciting technical developments aiming to overcome still existing limitations are expected to pave the way for a promising future of rotational spectroscopy.