CHEMICAL REACTIONS WITH VIBRATIONALLY HIGHLY EXITED MOLECULES

Project Information

Grant agreement ID: SC1*0228

Project closed

Start date 1 September 1989

End date 31 August 1991

Funded under

• Programme plan (EEC) to stimulate the international cooperation and interchange needed by European research scientists (SCIENCE), 1988-1992

Total cost No data

EU contribution No data

Coordinated by

STICHTING KATHOLIEKE UNIVERSITEIT
Netherlands

Objective

Laser techniques for vibrational excitation have been improved. Tunability has reached 1 GHz around each carbon dioxide laser line, stability is better than 0.1 MHz over long periods, laser power is up to 25 W, computer control has been implemented for data handling, for linearisation of tuned frequency intervals and for generation of coherent multicolour laser interaction zones. It is now possible to study chemical reactions with rotationally selected molecules in high vibrational states, with excitation levels of up to 5000 per cm.

Analysis of reactive scattering data has determined a threshold energy of about 0.5 eV for the onset of the reaction sodium plus sulphur hexafluoride to sodium fluoride plus sulphur pentafluoride. A strong influence of vibrational excitation on the reaction probability was found.

Vibrationally excited sulphur hexafluoride molecules were used in scattering experiments to characterize a gallium selenide (001) surface. The azimuth angle was determined from helium atom diffraction measurements. The gallium selenide surface had an anisotropically corrugated nature.
Chemical reactions between vibrationally highly and efficiently excited molecules became possible due to recent developments (Nijmegen) connected to multiphoton excitation of polyatomics. This improved technique shall be applied to a simple system, of which considerable knowledge has been built up in recent years.
The scattering machine (Gottingen) allows differential cross section measurements. Being equipped with a laser for electronic excitation of the atomic beam the influence of this type of excitation can be studied at the same time. Additional options for single photon excitation of the molecule will be applied. Combining the
Nijmegen-Gottingen expertise promises new results in a virgin-field of research.

Fields of science

• natural sciences › chemical sciences › inorganic chemistry › noble gases
• natural sciences › chemical sciences › inorganic chemistry › alkali metals
• natural sciences › chemical sciences › inorganic chemistry › post-transition metals
• natural sciences › physical sciences › optics › laser physics
• natural sciences › physical sciences › theoretical physics › particle physics › photons

Programme(s)

• FP2-SCIENCE - Programme plan (EEC) to stimulate the international cooperation and interchange needed by European research scientists (SCIENCE), 1988-1992

Topic(s)

Data not available

Call for proposal

Data not available

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

STICHTING KATHOLIEKE UNIVERSITEIT

• EU contribution: No data
• Address: 6500 GL NIJMEGEN ; Netherlands
• Total cost: No data

Participants (1)

Max-Planck-Gesellschaft zur Förderung der Wissenschaften eV

Germany

• EU contribution: No data
• Address: Bunsenstraße 10 ; 37073 Göttingen
• Total cost: No data