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We have studied collisional perturbations of radio-frequency (rf)electric-dipole (E1) transitions between the nearly degenerate opposite-paritylevels in atomic dysprosium (Dy) in the presence of 10 to 80 $\mu$Torr ofH$_\text{2}$, N$_\text{2}$, He, Ar, Ne, Kr, and Xe. Collisional broadening andshift of the resonance, as well as the attenuation of the signal amplitude areobserved to be proportional to the foreign-gas density with the exception ofH$_2$ and Ne, for which no shifts were observed. Corresponding rates and crosssections are presented. In addition, rates and cross sections for O$_2$ areextracted from measurements using air as foreign gas. The primary motivationfor this study is the need for accurate determination of the shift rates, whichare needed in a laboratory search for the temporal variation of thefine-structure constant [A. T. Nguyen, D. Budker, S. K. Lamoreaux, and J. R.Torgerson, Phys. Rev. A \textbf{69}, 22105 (2004)].Comment: 11 pages, 8 figure

physical review. a, atomic, molecular, and optical physics/physical review, a, atomic, molecular, and optical physics

Collisional perturbation of radio-frequency<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>E</mml:mi><mml:mn>1</mml:mn></mml:mrow></mml:math>transitions in an atomic beam of dysprosium

Collisional perturbation of radio-frequencyE1transitions in an atomic beam of dysprosium