Zobrazeno 1 - 10
of 510
pro vyhledávání: '"Ahokas J"'
Autor:
Ahokas, J., Semakin, A., Järvinen, J., Hanski, O., Laptiyenko, A., Dvornichenko, V., Salonen, K., Burkley, Z., Crivelli, P., Golovizin, A., Nesvizhevsky, V., Nez, F., Yzombard, P., Widmann, E., Vasiliev, S.
We describe the design and performance of a large magnetic trap for storing and cooling of atomic hydrogen (H). The trap operates in the vacuum space of a dilution refrigerator at a temperature of 1.5 K. Aiming at a large volume of the trap we implem
Externí odkaz:
http://arxiv.org/abs/2108.09123
Autor:
Jarvinen, J., Zvezdov, D., Ahokas, J., Sheludyakov, S., Lehtonen, L., Vasiliev, S., Vlasenko, L., Ishikawa, Y., Fujii, Y.
We present an experimental study of the Dynamic Nuclear Polarization (DNP) of \si{} nuclei in silicon crystals of natural abundance doped with As in the temperature range 0.1-1 K and in strong magnetic field of 4.6 T. This ensures very high degree of
Externí odkaz:
http://arxiv.org/abs/1911.11654
Autor:
Lehtonen, L., Vainio, O., Ahokas, J., Järvinen, J., Sheludyakov, S., Suominen, K. -A., Vasiliev, S., Khmelenko, V., Lee, D. M.
Publikováno v:
Phys. Scr. 93 094002 (2018)
Our recent experimental work on electron spin waves in atomic hydrogen gas has prompted a revisit of the theory of the Identical Spin Rotation Effect (ISRE). A key characteristic determining the properties of the spin waves is the quality factor of I
Externí odkaz:
http://arxiv.org/abs/1804.10431
Autor:
Järvinen, J., Ahokas, J., Sheludyakov, S., Vainio, O., Lehtonen, L., Vasiliev, S., Zvezdov, D., Vlasenko, L.
We present the results of experiments on dynamic nuclear polarization and relaxation of 75As in silicon crystals. Experiments are performed in strong magnetic fields of 4.6 T and temperatures below 1 K. At these conditions donor electron spins are fu
Externí odkaz:
http://arxiv.org/abs/1611.04384
Autor:
Sheludiakov, S., Ahokas, J., Järvinen, J., Vainio, O., Lehtonen, L., Vasiliev, S., Lee, D. M., Khmelenko, V. V.
We report on a study of Dynamic Nuclear Polarization and electron and nuclear spin relaxation of atomic hydrogen and deuterium in solid molecular matrices of H$_{2}$, D$_{2}$, and HD mixtures. The electron and nuclear spin relaxation times ($T_{1e}$
Externí odkaz:
http://arxiv.org/abs/1609.09772
Autor:
Lehtonen, L., Vainio, O., Ahokas, J., Järvinen, J., Novotny, S., Sheludyakov, S., Suominen, K. -A., Vasiliev, S., Khmelenko, V., Lee, D. M.
Publikováno v:
New J. Phys. 20 055010 (2018)
We present an experimental study of electron spin waves in atomic hydrogen gas compressed to high densities of $\sim 5 \times 10^{18}$ cm$^{-3}$ at temperatures ranging from 0.26 to 0.6 K in strong magnetic field of 4.6 T. Hydrogen gas is in a quantu
Externí odkaz:
http://arxiv.org/abs/1609.08432
Autor:
Sheludiakov, S., Ahokas, J., Järvinen, J., Vainio, O., Lehtonen, L., Zvezdov, D., Vasiliev, S., Lee, D. M., Khmelenko, V. V.
We report on the first ESR study of atomic hydrogen and tritium stabilized in a solid T$_{2}$ and T$_{2}$:H$_{2}$ matrices down to 70$\,$mK. The concentrations of T atoms in pure T$_{2}$ approached $2\times10^{20}$cm$^{-3}$ and record-high concentrat
Externí odkaz:
http://arxiv.org/abs/1609.06564
Autor:
Sheludiakov, S., Ahokas, J., Järvinen, J., Zvezdov, D., Lehtonen, L., Vainio, O., Vasiliev, S., Lee, D. M., Khmelenko, V. V.
We report on a study of the exchange tunneling reaction D+HD$\rightarrow$D$_{2}$+H in a pure solid HD matrix and in a D$_{2}$ matrix with 0.23$\%$ HD admixture at temperatures between 130$\,$mK and 1.5$\,$K. We found that the exchange reaction rates,
Externí odkaz:
http://arxiv.org/abs/1509.05588
Autor:
Vainio, O., Ahokas, J., Järvinen, J., Lehtonen, L., Novotny, S., Sheludiakov, S., Suominen, K. -A., Vasiliev, S., Zvezdov, D., Khmelenko, V. V., Lee, D. M.
Publikováno v:
Phys. Rev. Lett. 114, 125304 (2015)
We report on experimental observation of BEC-like behaviour of quantized electron spin waves (magnons) in a dense gas of spin polarized atomic hydrogen. The magnons are trapped and controlled with inhomogeneous magnetic fields, and described by a Sch
Externí odkaz:
http://arxiv.org/abs/1502.03963
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