High-precision spectroscopy of the HD+ molecule at the 1-p.p.b. level

被引：18
作者：
Biesheuvel, J. [1 ,4 ]
Karr, J. -Ph. [2 ,3 ]
Hilico, L. [2 ,3 ]
Eikema, K. S. E. [1 ]
Ubachs, W. [1 ]
Koelemeij, J. C. J. [1 ]
机构：
[1] Vrije Univ, Dept Phys & Astron, LaserLaB, De Boelelaan 1081, NL-1081 HV Amsterdam, Netherlands
[2] UPMC Sorbonne Univ, ENS PSL Res Univ, Coll France, Lab Kastler Brossel,CNRS, 4 Pl Jussieu, F-75005 Paris, France
[3] Univ Evry Val dEssonne, Dept Phys, Blvd Francois Mitterrand, F-91025 Evry, France
[4] Stat Netherlands CBS, POB 24500, NL-2490 HA The Hague, Netherlands
来源：
APPLIED PHYSICS B-LASERS AND OPTICS | 2017年 / 123卷 / 01期
关键词：
INFRARED-SPECTRUM; IONS; VALUES; H-3+;
D O I：
10.1007/s00340-016-6576-8
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Recently we reported a high-precision optical frequency measurement of the (nu, L): (0, 2) -> (8, 3) vibrational overtone transition in trapped deuterated molecular hydrogen (HD+) ions at 10 mK temperature. Achieving a resolution of 0.85 parts-per-billion (p.p.b.), we found the experimental value [nu(0) = 383, 407, 177.38 (41) MHz] to be in agreement with the value from molecular theory [nu th 383, 407, 177.150 (15) MHz] within 0.6 (1.1) p.p.b. (Biesheuvel et al. in Nat Commun 7: 10385, 2016). This enabled an improved test of molecular theory (including QED), new constraints on the size of possible effects due to 'new physics,' and the first determination of the proton-electron mass ratio from a molecule. Here, we provide the details of the experimental procedure, spectral analysis, and the assessment of systematic frequency shifts. Our analysis focuses in particular on deviations of the HD+ velocity distribution from thermal (Gaussian) distributions under the influence of collisions with fast ions produced during (laser-induced) chemical reactions, as such deviations turn out to significantly shift the hyperfine-less vibrational frequency as inferred from the saturated and Doppler-broadened spectrum, which contains partly unresolved hyperfine structure.
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页数：22
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