Frequency metrology in quantum degenerate helium

Frequency metrology in quantum degenerate helium

We have measured the absolute frequency of the 1557-nm doubly forbidden transition between the two metastable states of helium, 2 3S1 (lifetime 8000 s) and 2 1S0 (lifetime 20 ms), with 1 kHz precision. With an Einstein coefficient of 10−7 s−1 this is one of weakest optical transitions ever measured....

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Main Author: Vassen Wim
Format: Article
Language:English
Published: EDP Sciences 2013-08-01
Series:EPJ Web of Conferences
Online Access:http://dx.doi.org/10.1051/epjconf/20135702006
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spelling doaj-1fb971db1d834c968ad8ffd722079eb02021-08-02T01:33:42ZengEDP SciencesEPJ Web of Conferences2100-014X2013-08-01570200610.1051/epjconf/20135702006Frequency metrology in quantum degenerate heliumVassen WimWe have measured the absolute frequency of the 1557-nm doubly forbidden transition between the two metastable states of helium, 2 3S1 (lifetime 8000 s) and 2 1S0 (lifetime 20 ms), with 1 kHz precision. With an Einstein coefficient of 10−7 s−1 this is one of weakest optical transitions ever measured. The measurement was performed in a Bose-Einstein condensate of 4He* as well as in a Degenerate Fermi Gas of 3He*, trapped in a crossed dipole trap. From the isotope shift we deduced the nuclear charge radius difference between the α-particle and the helion. Our value differs by 4σ with a very recent result obtained on the 2 3S → 2 3P transition. http://dx.doi.org/10.1051/epjconf/20135702006
collection DOAJ
language English
format Article
sources DOAJ
author Vassen Wim
spellingShingle Vassen Wim
Frequency metrology in quantum degenerate helium
EPJ Web of Conferences
author_facet Vassen Wim
author_sort Vassen Wim
title Frequency metrology in quantum degenerate helium
title_short Frequency metrology in quantum degenerate helium
title_full Frequency metrology in quantum degenerate helium
title_fullStr Frequency metrology in quantum degenerate helium
title_full_unstemmed Frequency metrology in quantum degenerate helium
title_sort frequency metrology in quantum degenerate helium
publisher EDP Sciences
series EPJ Web of Conferences
issn 2100-014X
publishDate 2013-08-01
description We have measured the absolute frequency of the 1557-nm doubly forbidden transition between the two metastable states of helium, 2 3S1 (lifetime 8000 s) and 2 1S0 (lifetime 20 ms), with 1 kHz precision. With an Einstein coefficient of 10−7 s−1 this is one of weakest optical transitions ever measured. The measurement was performed in a Bose-Einstein condensate of 4He* as well as in a Degenerate Fermi Gas of 3He*, trapped in a crossed dipole trap. From the isotope shift we deduced the nuclear charge radius difference between the α-particle and the helion. Our value differs by 4σ with a very recent result obtained on the 2 3S → 2 3P transition.
url http://dx.doi.org/10.1051/epjconf/20135702006
work_keys_str_mv AT vassenwim frequencymetrologyinquantumdegeneratehelium
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