Growth and characterization of thorium-doped calcium fluoride single crystals

被引：18

作者：

Beeks, Kjeld ^{[1
]}

Sikorsky, Tomas ^{[2
]}

Rosecker, Veronika ^{[2
]}

Pressler, Martin ^{[2
]}

Schaden, Fabian ^{[2
]}

Werban, David ^{[2
]}

Hosseini, Niyusha ^{[2
]}

Rudischer, Lukas ^{[2
]}

Schneider, Felix ^{[2
]}

Berwian, Patrick ^{[3
]}

Friedrich, Jochen ^{[3
]}

Hainz, Dieter ^{[4
]}

Welch, Jan ^{[5
]}

Sterba, Johannes H. ^{[5
]}

Kazakov, Georgy ^{[2
]}

Schumm, Thorsten ^{[2
]}

机构：

[1] Ecole Polytech Fed Lausanne EPFL, Inst Phys, Lab Ultrafast Microscopy & Electron Scattering LUM, Stn 6, CH-1015 Lausanne, Switzerland

[2] TU Wien, Inst Atom & Subatom Phys, Stadionallee 2, A-1020 Vienna, Austria

[3] Fraunhofer Inst Integrierte Syst & Bauelementetech, Schottkystr 10, D-91058 Erlangen, Germany

[4] TU Wien, TRIGA Ctr Atominst, Stadionallee 2, A-1020 Vienna, Austria

[5] TU Wien, CLIP, TRIGA Ctr Atominst, Stadionallee 2, A-1020 Vienna, Austria

来源：

SCIENTIFIC REPORTS | 2023年 / 13卷 / 01期

基金：

奥地利科学基金会; 欧洲研究理事会;

关键词：

IONIC-CONDUCTIVITY; CAF2; TRANSMISSION;

D O I：

10.1038/s41598-023-31045-5

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

We have grown Th-232:CaF (2) and Th-229:CaF (2) single crystals for investigations on the VUV laser-accessible first nuclear excited state of Th-229, with the aim of building a solid-state nuclear clock. To reach high doping concentrations despite the extreme scarcity (and radioactivity) of Th-229, we have scaled down the crystal volume by a factor 100 compared to established commercial or scientific growth processes. We use the vertical gradient freeze method on 3.2 mm diameter seed single crystals with a 2 mm drilled pocket, filled with a co-precipitated CaF (2):ThF 4:PbF (2) powder in order to grow single crystals. Concentrations of 4 center dot 1019 cm (- 3) have been realized with Th-232 with good (> 10%) VUV transmission. However, the intrinsic radioactivity of Th-229 drives radio-induced dissociation during growth and radiation damage after solidification. Both lead to a degradation of VUV transmission, currently limiting the (229) Th concentration to < 5 x 10(17) cm (- 3).

引用

页数：10

共 38 条

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