Crossed-beam experiment on intramultiplet mixing collisions with short-lived Ne** /(2p)/sup 5/(3p)/ atoms

Journal Article · Sat Oct 15 00:00:00 EDT 1988 · J. Chem. Phys.; (United States)

OSTI ID:7065605

Manders, M P.I.; Ruyten, W M; Beucken, F V.D.; Driessen, J P.J.; Veugelers, W J.T.; Kramer, P H; Vredenbregt, E J.D.; van Hoek, W B.M.; Sandker, G J; Beijerinck, H C.W.; others, and

We describe the design, operation, and calibration of a crossed-beam experiment for the study of intramultiplet mixing collisions of short-lived electronically excited Ne/(2p)/sup 5/(3p)/equivalent/..cap alpha../ atoms with ground-state atoms/molecules. The excellent performance of almost 1 kHz/A/sup 2/ (number of counts per unit of inelastic cross section) enables us to measure, with good accuracy, absolute total Ne**--X cross sections Q/sup chemically bond//sup M//sup >//sup k/chemically bond$/sub l//sub left-arrow//sub k/, for the /..cap alpha..//sub k/..-->../..cap alpha..//sub l/ transition. Here M/sub k/ is the magnetic quantum number of the electronic angular momentum J of the initial /..cap alpha..//sub k/ state with respect to the asymptotic relative velocity. The polarized /..cap alpha..//sub k/ state is produced with a polarized laser. Narrow-band interference filters are used to detect the fluorescence radiation from the short-lived /..cap alpha..//sub k/ and /..cap alpha..//sub l/ states. An extensive series of measurements has been undertaken to calibrate the experiment. These are related to, e.g., beam properties, the optical-pumping process, and the optical detection system. The basic principles of the collision experiment itself have been thoroughly examined as well. We discuss the kinds of experiments it is possible to perform. These have yielded absolute (within 30%) cross sections between 0.05 and 50 A/sup 2/.

• Research Organization: Physics Department, Eindhoven University of Technology, P. O. Box 513, 5600 MB Eindhoven, The Netherlands
• OSTI ID: 7065605
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 89:8; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ARGON
ATOM COLLISIONS
ATOM-ATOM COLLISIONS
ATOM-MOLECULE COLLISIONS
ATOMIC BEAMS
BEAMS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
COLLISIONS
CROSS SECTIONS
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
FLUIDS
GASES
HELIUM
HYDROGEN
KRYPTON
MOLECULE COLLISIONS
NEON
NITROGEN COMPOUNDS
NITROGEN OXIDES
NITROUS OXIDE
NONMETALS
OPTICAL PUMPING
OXIDES
OXYGEN COMPOUNDS
PUMPING
RARE GASES
XENON