Tritium Laboratory Karlsruhe – 30 years – 23rd-25th May 2023

Sub-Doppler ro-vibrational spectroscopy on HT

May 24, 2023, 2:00 PM

1h 30m

R410 (B401)

Poster presentations Poster session

Speaker

Valentin Hermann (Tritium Laboratory Karlsruhe, Karlsruhe Institute of Technology, Germany)

Description

Tests of molecular quantum electrodynamics in the hydrogen benchmark species have predominantly targeted stable isotopes such as H2, HD, and D2. Accurate dissociation energy measurements [1] have shown remarkable agreement with theoretical predictions [2,3]. While various cavity-enhanced techniques have been employed to measure vibrational splittings, particularly in HD [4,5], these endeavors have encountered challenges due to dispersive line shapes with multiple interpretations [6,7], restricting the precision of determining molecular vibrational level splittings. However, comparisons of numerous P and R lines have enabled the determination of highly accurate rotational level splittings [7].
Incorporating tritium-containing isotopologues in QED tests of hydrogen species provides new perspectives and deepens our understanding of these systems. Coherent Anti-Stokes Raman spectroscopy (CARS) has recently been utilized to measure vibrational splitting in T2, HT, and DT [8], albeit with an accuracy limited to a few MHz. We aim to significantly enhance the accuracy by employing our developed NICE-OHMS technology to measure the HT overtone spectrum. We have developed a specialized setup for HT spectroscopy under radiation safety conditions. Loading and handling the HT gas is done by employing an non-evaporable getter. We present the newest results from this nowel setup.

[1] C. Cheng, J. Hussels, M. Niu, H.L. Bethlem, K.S.E. Eikema, E.J. Salumbides, W. Ubachs, M. Beyer, N. Hoelsch, J.A. Agner, F. Merkt, L.G. Tao, S.M. Hu, C. Jungen, PRL 121, 013001 (2018)
[2] J. Komasa, M. Puchalski, P. Czachorowski, G. Lach, K. Pachucki, Phys. Rev. A 100, 032519 (2019).
[3] M. Puchalski, J. Komasa, A. Spyszkiewicz, and K. Pachucki, Phys. Rev. A 100, 020503(R) (2019).
[4] F.M.J. Cozijn, P. Dupre, E.J. Salumbides, K.S.E. Eikema, W. Ubachs. PRL 120, 153002 (2018).
[5] L.G. Tao, A.W. Liu, K. Pachucki, J. Komasa, Y.R. Sun, J. Wang, S.-M. Hu, PRL 120, 153001 (2018).
[6] Y.N. Lv, A.W. Liu, Y. Tan, C.L. Hu, T.P. Hua, X.B. Zou, Y.R. Sun, C.L. Zou, G.C. Guo, S.M. Hu, PRL 129, 163201 (2022).
[7] M.L. Diouf, F.M.J. Cozijn, V. Hermann, E.J. Salumbides, M. Schloesser, W. Ubachs, Phys. Rev. A 105, 062823 (2022).
[8] K.F. Lai, V. Hermann, T.M. Trivikram, M.L. Diouf, M. Schloesser, W. Ubachs, E.J. Salumbides, Phys. Chem. Chem. Phys. 22, 8973-8987 (2020).