Spectroscopy of atomic and molecular defects in solid ⁴He using optical, microwave, radio frequency, magnetic and electric fields (Review Article)

• Опубліковано в: : Физика низких температур
• Дата: 2006
• Автори: Moroshkin, P., Hofer, A., Ulzega, S., Weis, A.
• Формат: Стаття
• Мова: Англійська
• Опубліковано: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2006
• Теми: Quantum Liquids and Solids
• Онлайн доступ: https://nasplib.isofts.kiev.ua/handle/123456789/120885
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Spectroscopy of atomic and molecular defects in solid ⁴He using optical, microwave, radio frequency, magnetic and electric fields (Review Article) / P. Moroshkin, A. Hofer, S. Ulzega, A. Weis // Физика низких температур. — 2006. — Т. 32, № 11. — С. 1297–1319. — Бібліогр.: 82 назв. — англ.

A little more than a decade ago our team extended the field of defect spectroscopy in
 cryocrystals to solid ⁴He matrices, in both their body-centered cubic (bcc) and hexagonally
 close-packed (hcp) configurations. In this review paper we survey our pioneering activities in the
 field and compare our results to those obtained in the related fields of doped superfluid helium and
 doped helium nanodroplets, domains developed in parallel to our own efforts. We present experimental
 details of the sample preparation and the different spectroscopic techniques. Experimental
 results of purely optical spectroscopic studies in atoms, exciplexes, and dimers and their interpretation
 in terms of the so-called bubble model will be discussed. A large part of the paper is devoted
 to optically detected magnetic resonance, ODMR, processes in alkali atoms. The quantum nature
 of the helium matrix and the highly isotropic shape of the local trapping sites in the bcc phase
 make solid helium crystals ideal matrices for high resolution spin physics experiments. We have investigated
 the matrix effects on both Zeeman and hyperfine magnetic resonance transitions and
 used ODMR to measure the forbidden electric tensor polarizability in the ground state of cesium.
 Several unexpected changes of the optical and spin properties during the bcc—hcp phase transition
 can be explained in terms of small bubble deformations.