An apparatus with gas-dynamical molecular beam source (GMBS) has been developed providing formation of cool supersonic atomic and molecular beams with 1018 part/cm2 s intensity and angular divergence of <1.5°. The apparatus design enables one to generate cluster beams of various substances. All parameters of the apparatus are continuously controlled in an automated mode. An oil-free vacuum pumping provides a limiting pressure from 2 × 10-7 up to < 10-9 Torr allowing one to study the interaction of gas flows with solid surfaces with subsequent structural analysis by means of a photoelectron X-ray spectroscopy. The cluster beams of the Ar atoms, CO2 molecules and Ar(CO2) mixture have been studied by means of a mass-spectrometric method. The production of the ArNX-like and (CO2)NX-like associated clusters (where X = H, H2 and OH) has been observed. In the mass-spectrum for the argon + carbon dioxide mixture, besides the basic (parent) ArN and (CO2)N clusters, the composite [Arn(CO2)m]N-like clusters have been found comprising the mass peaks related to the various combinations of daughter Arn and (CO2)m clusters with (n + m = N) total size of incorporated molecules.
Nuclear Instruments and Methods in Physics Research B
- Pub Date:
- April 1996
- QUADRUPOLE MASS-SPECTROMETER;
- ION YIELD;