EXCITATION OF Ne, Ar, AND Kr INDUCED BY H$sup +$ AND He$sup +$ IMPACT (5-35 kev)

Journal Article · Mon Apr 15 04:00:00 EST 1963 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.130.656· OSTI ID:4736715

van Eck, J; de Heer, F J; Kistemaker, J

Impact radiation from H/sup +/ and He/sup +/ in noble gases is studied in the wavelength region below 1250 A. A vacuum spectrograph is calibrated for this purpose, so that the measurements provide absolute excitation or emission cross sections. Strong maxima are observed in the light intensities of some atom and ion lines of noble gases. These maxima appear at remarkably low energies of the impinging particles, and moreover, correspond with large absolute cross sections ( y from 92% to 6 10/sup 17/ cm/sup 2//atom). For instance, the excitation of the np/sup 6//sup 2/S/sub 1/2/ states of Ar II (n = 3) and Kr II ( n 4) induced by the He/sup +/ impact on Ar and Kr show maxima at 9 and 7 kev, respectively. This observation can be predicted by the adiabatic criterion. However, for the (n + 1)s' /sup 2/D/sub 3/2/ states of Ar II (n = 3) and Kr II (n =4) the maxima lie below 5 kev, though more energy is needed for the excitation of these states than for the /sup 2/S,/sub 1/2/ ones. Also for the excitation of the 2p/sup 5/ 3s state of Ne I induced by He/sup +/ impact on Ne, the maximum lies below 5 kev. There are indications that intermediate molecular states occur that contribute to the formation of these low-energy maxima. (auth)

• Research Organization: F.O.M.-Lab. for Mass Separation, Amsterdam
• NSA Number: NSA-17-019340
• OSTI ID: 4736715
• Journal Information: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 130; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALUMINUM 27
ANNIHILATION
ARGON
BORON 10
CROSS SECTIONS
EMISSION
ENERGY LEVELS
ENERGY RANGE
EXCITATION
GAMMA RADIATION
HELIUM
HYDROGEN
IONS
KRYPTON
MAGNESIUM 26
MEASURED VALUES
NEON
NEUTRONS
PHOSPHORUS 31
PHYSICS
POSITRONS
PROTONS
RARE GASES
SPECTROMETERS
SULFUR 32
VACUUM