Collinear laser spectroscopy of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mrow><mml:mi>Ca</mml:mi></mml:mrow><mml:mo>+</mml:mo></mml:msup></mml:math>: Solving the field-shift puzzle of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>4</mml:mn><mml:mi>s</mml:mi><mml:mmultiscripts><mml:mi mathvariant="normal">S</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mn>2</mml:mn></mml:mrow><mml:none/><mml:mprescripts/><mml:none/><mml:mn>2</mml:mn></mml:mmultiscripts><mml:mo>→</mml:mo><mml:mn>4</mml:mn><mml:mi>p</mml:mi><mml:mmultiscripts><mml:mi mathvariant="normal">P</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mn>2</mml:mn><mml:mo>,</mml:mo><mml:mn>3</mml:mn><mml:mo>/</mml:mo><mml:mn>2</mml:mn></mml:mrow><mml:none/><mml:mprescripts/><mml:none/><mml:mn>2</mml:mn></mml:mmultiscripts></mml:mrow></mml:math> transitions
Patrick Müller, Kristian König, Phillip Imgram, Jörg Krämer, W. Nörtershäuser
Abstract
High-precision quasisimultaneous collinear/anticollinear laser spectroscopy was used to measure the 4s 2 S 1/2 4p 2 P 1/2 (D1) and the 4s 2 S 1/2 4p 2 P 3/2 (D2) as well as the three 3d 4p transitions in the naturally abundant Ca + isotopes. Thereby, accuracies of approximately 100 kHz were achieved, which enabled an accurate determination of the field-shift ratio in the D2 and D1 lines through a King-plot analysis. Our value of F D2 /F D1 = 1.0010( A successful check of consistency was made by combining the measurements of the D1 and D2 lines with those of the 3d 4p transitions and precise literature values for the 4s 3d and 3d 2 D 3/2 3d 2 D 5/2 transitions. Failing for the previous ion-trap measurements, the check of consistency strongly indicates that our results constitute a solution to this puzzle, supporting the results of atomic theory.