Excitation of $^{1}S$ and $^{3}S$ Metastable Helium Atoms to Doubly Excited States

Excitation of ${}^{1}S$ and ${}^{3}S$ Metastable Helium Atoms to Doubly Excited States

M. Alagia, M. Coreno, H. Farrokhpour, P. Franceschi, A. Mihelič, A. Moise, R. Omidyan, K. C. Prince, R. Richter, J. Söderström, S. Stranges, M. Tabrizchi, and M. Žitnik

Phys. Rev. Lett. 102, 153001 – Published 14 April 2009

Abstract

We present spectra of triplet and singlet metastable helium atoms resonantly photoexcited to doubly excited states. The first members of three dipole-allowed ${}^{1, 3}P^{o}$ series have been observed and their relative photoionization cross sections determined, both in the triplet (from $1 s 2 s$ ${}^{3}S^{e}$ ) and singlet (from $1 s 2 s$ ${}^{1}S^{e}$ ) manifolds. The intensity ratios are drastically different with respect to transitions from the ground state. When radiation damping is included the results for the singlets are in agreement with theory, while for triplets spin-orbit interaction must also be taken into account.

Received 4 October 2008

DOI:https://doi.org/10.1103/PhysRevLett.102.153001

Authors & Affiliations

M. Alagia^1,2, M. Coreno³, H. Farrokhpour⁴, P. Franceschi⁵, A. Mihelič⁶, A. Moise⁷, R. Omidyan⁴, K. C. Prince⁷, R. Richter^7,*, J. Söderström^8,9, S. Stranges^10,2, M. Tabrizchi⁴, and M. Žitnik⁶

¹CNR-ISMN Sezione Roma, Piazzale A. Moro 5, I-00185 Roma, Italy
²Laboratorio Nazionale TASC, CNR-INFM, I-34012 Trieste, Italy
³CNR-IMIP, Montelibretti, I-00016 Roma, Italy
⁴Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Iran
⁵Dipartimento di Fisica, Università di Trento, I-38050 Povo (TN), Italy
⁶Jožef Stefan Institute, P.O. Box 3000, SI-1001 Ljubljana, Slovenia
⁷Sincrotrone Trieste, in Area Science Park, I-34012 Basovizza, Trieste, Italy
⁸Department of Physics, Uppsala University, Box 530, S-75121 Uppsala, Sweden
⁹Synchrotron SOLEIL, l’Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
¹⁰Dipartimento di Chimica, Università “La Sapienza,” I-00185 Roma, Italy

^*robert.richter@elettra.trieste.it

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand

Issue

Vol. 102, Iss. 15 — 17 April 2009

Reuse & Permissions

Access Options

Author publication services for translation and copyediting assistance advertisement

Physical Review Letters

Excitation of S1 and S3 Metastable Helium Atoms to Doubly Excited States

M. Alagia, M. Coreno, H. Farrokhpour, P. Franceschi, A. Mihelič, A. Moise, R. Omidyan, K. C. Prince, R. Richter, J. Söderström, S. Stranges, M. Tabrizchi, and M. Žitnik

Phys. Rev. Lett. 102, 153001 – Published 14 April 2009

Abstract

Authors & Affiliations

Article Text (Subscription Required)

References (Subscription Required)

Issue

Access Options

Authorization Required

Other Options

Download & Share

Images

Figure 1

Figure 2

Log In

Search

Article Lookup

Paste a citation or DOI

Enter a citation

Excitation of ${}^{1}S$ and ${}^{3}S$ Metastable Helium Atoms to Doubly Excited States