Observation of Triplet Doubly Excited States in Single Photon Excitation from Ground State Helium

F. Penent; P. Lablanquie; R.I. Hall; M. Zitnik; K. Bucar; S. Stranges; R. Richter; M. Alagia; Peter Hammond; J.G. Lambourne

doi:10.1103/PhysRevLett.86.2758

Observation of Triplet Doubly Excited States in Single Photon Excitation from Ground State Helium

F. Penent, P. Lablanquie, R.I. Hall, M. Zitnik, K. Bucar, S. Stranges, R. Richter, M. Alagia, Peter Hammond, J.G. Lambourne

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Abstract

We have observed, for the first time, LS-forbidden triplet doubly excited states, in single photon excitation of ground state helium, below the second ionization threshold. These states are identified as D-3(0) and P-3(0) and their excitation is due to spin-orbit interaction that mixes them with the optically allowed P-1(0) states. This observation is possible due to the very high efficiency in detecting metastable atoms created after the fluorescence decay of the doubly excited states, and the new capabilities of third generation synchrotron vacuum ultraviolet sources with high resolution beam lines.

Original language	English
Pages (from-to)	2758-2761
Journal	Physical Review Letters
Volume	86
Issue number	13
DOIs	https://doi.org/10.1103/PhysRevLett.86.2758
Publication status	Published - 2001

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title = "Observation of Triplet Doubly Excited States in Single Photon Excitation from Ground State Helium",

abstract = "We have observed, for the first time, LS-forbidden triplet doubly excited states, in single photon excitation of ground state helium, below the second ionization threshold. These states are identified as D-3(0) and P-3(0) and their excitation is due to spin-orbit interaction that mixes them with the optically allowed P-1(0) states. This observation is possible due to the very high efficiency in detecting metastable atoms created after the fluorescence decay of the doubly excited states, and the new capabilities of third generation synchrotron vacuum ultraviolet sources with high resolution beam lines.",

author = "F. Penent and P. Lablanquie and R.I. Hall and M. Zitnik and K. Bucar and S. Stranges and R. Richter and M. Alagia and Peter Hammond and J.G. Lambourne",

year = "2001",

doi = "10.1103/PhysRevLett.86.2758",

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pages = "2758--2761",

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T1 - Observation of Triplet Doubly Excited States in Single Photon Excitation from Ground State Helium

AU - Penent, F.

AU - Lablanquie, P.

AU - Hall, R.I.

AU - Zitnik, M.

AU - Bucar, K.

AU - Stranges, S.

AU - Richter, R.

AU - Alagia, M.

AU - Hammond, Peter

AU - Lambourne, J.G.

PY - 2001

Y1 - 2001

N2 - We have observed, for the first time, LS-forbidden triplet doubly excited states, in single photon excitation of ground state helium, below the second ionization threshold. These states are identified as D-3(0) and P-3(0) and their excitation is due to spin-orbit interaction that mixes them with the optically allowed P-1(0) states. This observation is possible due to the very high efficiency in detecting metastable atoms created after the fluorescence decay of the doubly excited states, and the new capabilities of third generation synchrotron vacuum ultraviolet sources with high resolution beam lines.

AB - We have observed, for the first time, LS-forbidden triplet doubly excited states, in single photon excitation of ground state helium, below the second ionization threshold. These states are identified as D-3(0) and P-3(0) and their excitation is due to spin-orbit interaction that mixes them with the optically allowed P-1(0) states. This observation is possible due to the very high efficiency in detecting metastable atoms created after the fluorescence decay of the doubly excited states, and the new capabilities of third generation synchrotron vacuum ultraviolet sources with high resolution beam lines.

U2 - 10.1103/PhysRevLett.86.2758

DO - 10.1103/PhysRevLett.86.2758

M3 - Article

SN - 0031-9007

VL - 86

SP - 2758

EP - 2761

JO - Physical Review Letters

JF - Physical Review Letters

IS - 13

ER -

Observation of Triplet Doubly Excited States in Single Photon Excitation from Ground State Helium

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