Collisional quenching of metastable x-ray emitting states in a fast beam of He-like fluorine

Conference · Mon Sep 01 00:00:00 EDT 1975

OSTI ID:4146632

Matthews, D L; Fortner, R J

High resolution x-ray spectral measurements are used to determine the relative intensity of He-like fluorine x-ray transitions, 2 $sup 3$$P$$sub 1$ $Yields$ 1 $sup 1$$S$$sub 0$ and $sup 1$$P$$sub 1$ $Yields$ $sup 1$$S$$sub 0$, produced in fluorine collisions with Ne, Ar, and Kr gas targets at various pressures and in thin carbon foils and a thick carbon slab. The relative intensities are observed to be strong functions of both target density and incident charge Z. These effects are attributed to strong collisional quenching of both initial states by subsequent large impact parameter collisions. The data permit extraction for the first time of the total quenching cross sections (sigma/sub Q/ ) for fast fluorine ions in both states. A strong enhancement of the relative intensity of the 2 $sup 3$$P$$sub 1$ is observed for F$sup 7+$ projectiles. This strong enhancement is attributed to selective excitation of metastable states in the beam, i.e., 1s2s $sup 3$$S$$sub 1$, into the 1s2p $sup 3$$P$$sub 1$ state. Finally, the data for foil and solid targets are used to obtain new information on the excitation states of ions moving in solids. High resolution measurements of the radiative electron capture (REC) peak are reported and analyzed for the first time. 3 figs, 1 table (auth)

• Research Organization: California Univ., Livermore (USA). Lawrence Livermore Lab.
• DOE Contract Number: W-7405-ENG-48
• NSA Number: NSA-33-010297
• OSTI ID: 4146632
• Report Number(s): UCRL-77311; CONF-750975-4
• Resource Relation: Conference: 4. international conference on beam-foil spectroscopy, Gatlinburg, Tennessee, USA, 15 Sep 1975; Other Information: Orig. Receipt Date: 30-JUN-76
• Country of Publication: United States
• Language: English

Related Subjects

N60400* -Physics (Atomic & Molecular)-Collision Phenomena
640304* -Physics Research-Atomic
Molecular & Chemical Physics-Collision Phenomena
*ARGON- ION-ATOM COLLISIONS
*CARBON- X-RAY SPECTRA
*FLUORINE IONS- - X-RAY SPECTRA
*ION-ATOM COLLISIONS- X-RAY SPECTRA
*KRYPTON- ION-ATOM COLLISIONS
*NEON- ION-ATOM COLLISIONS
MEV RANGE 10-100