Abstract
Recently we reported a high-precision optical frequency measurement of the (v, 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 [Ν 0 = 383, 407, 177.38 (41) MHz] to be in agreement with the value from molecular theory [Νth 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 (laserinduced) chemical reactions, as such deviations turn out to significantly shift the hyperfine-less vibrational frequency as inferred from the saturated and Dopplerbroadened spectrum, which contains partly unresolved hyperfine structure.
| Original language | English |
|---|---|
| Title of host publication | Exploring the World with the Laser |
| Subtitle of host publication | Dedicated to Theodor Hänsch on his 75th Birthday |
| Place of Publication | Cham |
| Publisher | Springer International Publishing Switzerland |
| Pages | 267-307 |
| Number of pages | 41 |
| ISBN (Electronic) | 9783319643465 |
| ISBN (Print) | 9783319643458 |
| DOIs | |
| Publication status | Published - Jan 2018 |
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High-precision spectroscopy of the HD+ molecule at the 1-p.p.b. level. / Biesheuvel, J.; Karr, J. Ph; Hilico, L.; Eikema, K. S.E.; Ubachs, W.; Koelemeij, J. C.J.
Exploring the World with the Laser: Dedicated to Theodor Hänsch on his 75th Birthday. Cham : Springer International Publishing Switzerland, 2018. p. 267-307.Research output: Chapter in Book / Report / Conference proceeding › Chapter › Academic › peer-review
TY - CHAP
T1 - High-precision spectroscopy of the HD+ molecule at the 1-p.p.b. level
AU - Biesheuvel, J.
AU - Karr, J. Ph
AU - Hilico, L.
AU - Eikema, K. S.E.
AU - Ubachs, W.
AU - Koelemeij, J. C.J.
PY - 2018/1
Y1 - 2018/1
N2 - Recently we reported a high-precision optical frequency measurement of the (v, 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 [Ν 0 = 383, 407, 177.38 (41) MHz] to be in agreement with the value from molecular theory [Νth 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 (laserinduced) chemical reactions, as such deviations turn out to significantly shift the hyperfine-less vibrational frequency as inferred from the saturated and Dopplerbroadened spectrum, which contains partly unresolved hyperfine structure.
AB - Recently we reported a high-precision optical frequency measurement of the (v, 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 [Ν 0 = 383, 407, 177.38 (41) MHz] to be in agreement with the value from molecular theory [Νth 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 (laserinduced) chemical reactions, as such deviations turn out to significantly shift the hyperfine-less vibrational frequency as inferred from the saturated and Dopplerbroadened spectrum, which contains partly unresolved hyperfine structure.
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U2 - 10.1007/978-3-319-64346-5_16
DO - 10.1007/978-3-319-64346-5_16
M3 - Chapter
SN - 9783319643458
SP - 267
EP - 307
BT - Exploring the World with the Laser
PB - Springer International Publishing Switzerland
CY - Cham
ER -