PSAS 2012
International Conference on Precision Physics
of Simple Atomic Systems 2012
Eltville, Germany -
Information

Title:	Dr.
Family Name:	Karr
First Name:	Jean-Philippe
Gender:	male
E-Mail:	karrspectro.jussieu.fr
Affiliation for Badge:	Laboratoire Kastler Brossel
Institute:	Université d'Evry-Val d'Essonne
Address (Street):	4 place Jussieu, Case 74
Postal Code, City:	Paris Cedex 05
Country:	France
Phone:	(33)144276079
Fax:	(33)144273845
Arrival Date:	June 10
Departure Date:	June 15
Excursion with Conference Dinner:	Selected
Payment:	Bank transfer to GSI
Title:	High-precision spectroscopy of hydrogen molecular ions: theoretical and experimental advances
Abstract:	High-precision energy level calculations in three-body molecular systems such as H2+, HD+ and antiprotonic helium are a major issue for improving the determination of fundamental constants mp/me and mpbar/me [1-4]. The main obstacle on this road is an accurate evaluation of the Bethe logarithm [5] (at the leading order of radiative corrections m alpha^5) and its relativistic corrections (at order m alpha^7) [6-7]. I will present a numerical scheme which allows to obtain both quantities with unprecedented accuracy for a general three-body system, opening the way to mass ratio determinations at 0.1 ppb accuracy level. I will also describe the status of the H2+ two-photon spectroscopy experiment at Laboratoire Kastler Brossel in Paris [1]. Recent effort has been directed towards state-selective ion preparation by REMPI, which will increase the signal-to noise ratio by more than one order of magnitude. [1] J.-Ph. Karr, A. Douillet, L. Hilico, to appear in Appl. Phys. B (2012). DOI: 10.1007/s00340-011-4757-z. [2] J.C.J. Koelemeij, B. Roth, A. Wicht, I. Ernsting, S. Schiller, Phys. Rev. Lett. 98, 173002 (2007). [3] J.C.J. Koelemeij, D.W.E. Noom, D. de Jong, M.A. Haddad, W. Ubachs, to appear in Appl. Phys. B (2012). [4] M. Hori et al., Nature 475, 484 (2011). [5] H.A. Bethe and E.E. Salpeter, Quantum mechanics of one- and two- electron atoms, Plenum Publishing Co., New York, 1977. [6] U.D. Jentschura, A. Czarnecki, K. Pachucki, Phys. Rev. A 72, 062102 (2005). [7] J.-Ph. Karr, L. Hilico, V.I. Korobov, Can. J. Phys. 89, 104 (2011).

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