Photoionization of Sc{sup 2+} ions by synchrotron radiation: Measurements and absolute cross sections in the photon energy range 23-68 eV

Journal Article · Sat Mar 01 00:00:00 EST 2003 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.67.032702· OSTI ID:20633838

Schippers, S; Mueller, A ^[1]; Ricz, S ^[2]; Bannister, M E ^[3]; Dunn, G H ^[4]; Schlachter, A S ^[5]; Hinojosa, G; Cisneros, C ^[6]; Aguilar, A; Covington, A M; Gharaibeh, M F; Phaneuf, R A ^[7]

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1. Institut fuer Kernphysik, Justus-Liebig-Universitaet, 35392 Giessen (Germany)
2. Institute of Nuclear Research of the Hungarian Academy of Sciences (ATOMKI), H-4001 Debrecen (Hungary)
3. Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
4. JILA, University of Colorado, Boulder, Colorado 80309-0440 (United States)
5. Lawrence Berkeley National Laboratory, Advanced Light Source, Berkeley, California 94720-6-2100 (United States)
6. Centro de Ciencias Fisicas, Universidad Nacional Autonoma de Mexico, Apartado Postal 6-96, Cuernavaca 62131 (Mexico)
7. Department of Physics, University of Nevada, Reno, Nevada 89557 (United States)

Cross sections for the photoionization (PI) of Sc{sup 2+} ions with [Ar]3d ground-state configuration have been measured by employing the merged ion-photon beams method. The Sc{sup 2+} ions were produced from metallic vapor in an electron cyclotron resonance ion source, and the photon beam was generated by an undulator in the electron-synchrotron storage ring of the advanced light source of the Lawrence Berkeley National Laboratory. The experimental photon energy range 23-68 eV encompasses the direct 3d and 3p photoionization thresholds. The experimental photoion spectrum is dominated by autoionizing resonances due to 3p excitations predominantly decaying via Coster-Kronig and super-Coster-Kronig transitions. Individual resonances located around E{approx_equal}40.2 eV have been measured with an instrumental energy spread {delta}E as low as 1.2 meV, corresponding to a resolving power of E/({delta}E) around 33 500. The fractions of metastable ions in the Sc{sup 2+} ion beam are obtained by comparing the photoionization cross section with the recently measured [Schippers et al., Phys. Rev. A 65, 042723 (2002)] cross section for the time-reversed process of photorecombination of Sc{sup 3+} ions. Absolute strengths of several 3p{sup 5} 3d{sup 2} and 3p{sup 5} 3d 4s PI resonances have been determined. They are the same as the corresponding resonance strengths for isoelectronic Ca{sup +} ions.

• OSTI ID: 20633838
• Journal Information: Physical Review. A, Vol. 67, Issue 3; Other Information: DOI: 10.1103/PhysRevA.67.032702; (c) 2003 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ADVANCED LIGHT SOURCE
CALCIUM IONS
CATIONS
COSTER-KRONIG TRANSITIONS
CROSS SECTIONS
ECR ION SOURCES
ELECTRONS
EV RANGE
EXCITATION
GROUND STATES
ION BEAMS
MEV RANGE
PHOTOIONIZATION
PHOTON BEAMS
PHOTON-ATOM COLLISIONS
PHOTONS
RESONANCE
SCANDIUM
SCANDIUM IONS
SYNCHROTRON RADIATION