Journal
PHYSICAL REVIEW A
Volume 79, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.79.054501
Keywords
atom-photon collisions; field ionisation; microwave spectra; photoionisation; polarisability; positive ions; Rydberg states; spin-orbit interactions; strontium
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Funding
- U.S. Department of Energy
- Office of Basic Energy Sciences
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We use delayed field ionization to observe the microwave resonance transitions of Sr from 5snf to 5sng, 5snh, and 5sni. The energies of the 5sn center dot, center dot>3 states are split by the indirect spin-orbit coupling of the Sr core to the Rydberg electron, producing the K splittings. From the K splittings we extract the ionic dipole and quadrupole matrix elements, < 5s parallel to r parallel to 5p >=3.65(25)a(0) and < 5s parallel to r(2)parallel to 4d >=12(14)a(0)(2). From the dipole matrix element we obtain the dipole polarizability of Sr+. With the dipole polarizability and the quantum defect differences of adjacent l states, we can determine the Sr+ quadrupole polarizability. The dipole and quadrupole polarizabilities of Sr+ are alpha(d)=86(11)a(0)(3) and alpha(q)=1.1x10(3)(10)a(0)(5), respectively.
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