Zobrazeno 1 - 10
of 110
pro vyhledávání: '"Okhapkin, M."'
Autor:
Zitzer, G., Tiedau, J., Okhapkin, M. V., Zhang, K., Mokry, C., Runke, J., Düllmann, Ch. E., Peik, E.
Publikováno v:
Phys. Rev. A 109, 033116 (2024)
Sympathetic cooling of Th$^{3+}$ ions is demonstrated in an experiment where $^{229}$Th and $^{230}$Th are extracted from uranium recoil ion sources and are confined in a linear Paul trap together with laser-cooled $^{88}$Sr$^+$ ions. Because of thei
Externí odkaz:
http://arxiv.org/abs/2312.05106
Publikováno v:
Optics Letters, Vol. 44, Issue 7, pp. 1781-1784 (2019)
We present a Nd:YAG ultra-stable laser system operating at 946 nm and demonstrate a fractional frequency instability of $1.1\times10^{-16}$ at 1 s by pre-stabilizing it to a 30 cm-long ULE cavity at room temperature. All key analog components have be
Externí odkaz:
http://arxiv.org/abs/1902.07012
Autor:
Safronova, M. S., Porsev, S. G., Kozlov, M. G., Thielking, J., Okhapkin, M. V., Głowacki, P., Meier, D. M., Peik, E.
Publikováno v:
Phys. Rev. Lett. 121, 213001 (2018)
The isotope $^{229}$Th is unique in that it possesses an isomeric state of only a few eV above the ground state, suitable for nuclear laser excitation. An optical clock based on this transition is expected to be a very sensitive probe for variations
Externí odkaz:
http://arxiv.org/abs/1806.03525
Akademický článek
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Akademický článek
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Publikováno v:
Phys. Rev. A 92, 020503 (2015)
We have measured the hyperfine structure and isotope shifts of the 402.0 nm and 399.6 nm resonance lines in 229Th+. These transitions could provide pathways towards the 229Th isomeric nuclear state excitation. An unexpected negative isotope shift rel
Externí odkaz:
http://arxiv.org/abs/1505.05818
Publikováno v:
Phys. Rev. A 88, 012512 (2013)
Using resonant two-step laser excitation of trapped 232Th+ ions, we observe 43 previously unknown energy levels within the energy range from 7.3 to 8.3 eV. The high density of states promises a strongly enhanced electronic bridge excitation of the 22
Externí odkaz:
http://arxiv.org/abs/1305.0765
Autor:
Huntemann, N., Lipphardt, B., Okhapkin, M., Tamm, Chr., Peik, E., Taichenachev, A. V., Yudin, V. I.
Publikováno v:
Phys. Rev. Lett. 109, 213002 (2012)
We experimentally investigate a recently proposed optical excitation scheme [V.I. Yudin et al., Phys. Rev. A 82, 011804(R)(2010)] that is a generalization of Ramsey's method of separated oscillatory fields and consists of a sequence of three excitati
Externí odkaz:
http://arxiv.org/abs/1209.1992
Autor:
Herrera-Sancho, O. A., Okhapkin, M. V., Zimmermann, K., Tamm, Chr., Peik, E., Taichenachev, A. V., Yudin, V. I., Glowacki, P.
Publikováno v:
Phys. Rev. A 85, 033402 (2012)
Experiments on one- and two-photon laser excitation of 232Th+ ions in a radiofrequency ion trap are reported. As the first excitation step, the strongest resonance line at 402 nm from the 6d^2 7s J=3/2 ground state to the 6d7s7p J=5/2 state at 24874
Externí odkaz:
http://arxiv.org/abs/1202.0184
Publikováno v:
Applied Physics B 107, 883 (2012)
The production of ions via laser ablation for the loading of radiofrequency (RF) ion traps is investigated using a nitrogen laser with a maximum pulse energy of 0.17 mJ and a peak intensity of about 250 MW/cm^2. A time-of-flight mass spectrometer is
Externí odkaz:
http://arxiv.org/abs/1112.1664