Calculation of transition probabilities and ac Stark shifts in two-photon laser transitions of antiprotonic helium

Journal Article · Tue Jun 15 00:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.81.062508· OSTI ID:21437885

Hori, Masaki; Korobov, Vladimir I ^[1]

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1. Max-Planck-Institut fuer Quantenoptik, Hans-Kopfermann-Strasse 1, D-85748 Garching (Germany) and Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan)

Numerical ab initio variational calculations of the transition probabilities and ac Stark shifts in two-photon transitions of antiprotonic helium atoms driven by two counter-propagating laser beams are presented. We found that sub-Doppler spectroscopy is, in principle, possible by exciting transitions of the type (n,L){yields}(n-2,L-2) between antiprotonic states of principal and angular momentum quantum numbers n{approx}L-1{approx}35, first by using highly monochromatic, nanosecond laser beams of intensities 10{sup 4}-10{sup 5} W/cm{sup 2}, and then by tuning the virtual intermediate state close (e.g., within 10-20 GHz) to the real state (n-1,L-1) to enhance the nonlinear transition probability. We expect that ac Stark shifts of a few MHz or more will become an important source of systematic error at fractional precisions of better than a few parts in 10{sup 9}. These shifts can, in principle, be minimized and even canceled by selecting an optimum combination of laser intensities and frequencies. We simulated the resonance profiles of some two-photon transitions in the regions n=30-40 of the p{sup 4}He{sup +} and p{sup 3}He{sup +} isotopes to find the best conditions that would allow this.

• OSTI ID: 21437885
• Journal Information: Physical Review. A, Vol. 81, Issue 6; Other Information: DOI: 10.1103/PhysRevA.81.062508; (c) 2010 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ACCURACY
ANGULAR MOMENTUM
ANTIPROTONS
ENERGY LEVELS
EXCITATION
GHZ RANGE
HADRONIC ATOMS
HELIUM
HELIUM 3
HELIUM 4
INTERMEDIATE STATE
LASER RADIATION
MHZ RANGE
MONOCHROMATIC RADIATION
NONLINEAR PROBLEMS
PHOTON BEAMS
PHOTONS
PROBABILITY
QUANTUM NUMBERS
VARIATIONAL METHODS
ANTIBARYONS
ANTIMATTER
ANTINUCLEI
ANTINUCLEONS
ANTIPARTICLES
ATOMS
BARYONS
BEAMS
BOSONS
CALCULATION METHODS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ELEMENTS
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FERMIONS
FLUIDS
FREQUENCY RANGE
GASES
HADRONS
HELIUM ISOTOPES
ISOTOPES
LIGHT NUCLEI
MASSLESS PARTICLES
MATTER
NONMETALS
NUCLEI
NUCLEONS
PROTONS
RADIATIONS
RARE GASES
STABLE ISOTOPES