Experimental confirmation of photon-induced spin-flip transitions in helium via triplet metastable yield spectra

Journal Article · Tue Jun 15 00:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.81.062510· OSTI ID:21437887

Rubensson, Jan-Erik ^[1]; Moise, Angelica; Richter, Robert ^[2]; Mihelic, Andrej; Bucar, Klemen; Zitnik, Matjaz ^[3]

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1. Department of Physics and Astronomy, Box 530, S-75121 Uppsala (Sweden)
2. Sincrotrone Trieste, in Area Science Park, I-34149 Basovizza, Trieste (Italy)
3. Jozef Stefan Institute, Jamova cesta 39, SI-1000 Ljubljana (Slovenia)

Doubly excited states below the N=2 ionization threshold are populated by exciting helium atoms in a supersonic beam with monochromatized synchrotron radiation. The fluorescence decay of these states triggers a radiative cascade back to the ground state with large probability to populate long lived singlet and triplet helium metastable states. The yield of metastables is measured using a multichannel plate detector after the beam has passed a singlet-quenching discharge lamp. The variation of the yield observed with the lamp switched on or off is related to the triplet-singlet mixing of the doubly excited states.

• OSTI ID: 21437887
• Journal Information: Physical Review. A, Vol. 81, Issue 6; Other Information: DOI: 10.1103/PhysRevA.81.062510; (c) 2010 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ATOMS
DISCHARGE QUENCHING
EMISSION SPECTRA
FLUORESCENCE
HELIUM
IONIZATION
METASTABLE STATES
PHOTON-ATOM COLLISIONS
PHOTONS
SPIN FLIP
SYNCHROTRON RADIATION
TRIPLETS
ATOM COLLISIONS
BOSONS
BREMSSTRAHLUNG
COLLISIONS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ELEMENTS
EMISSION
ENERGY LEVELS
EXCITED STATES
FLUIDS
GASES
LUMINESCENCE
MASSLESS PARTICLES
MULTIPLETS
NONMETALS
PHOTON COLLISIONS
PHOTON EMISSION
RADIATIONS
RARE GASES
SPECTRA