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Nuclear Instruments and Methods

Stark effect modulations in He II and Li III

Eric H. Pinnington, H. G. Berry, Jean Desesquelles, J. L. Subtil

Published Jul 1, 1973• 15 citations
Publisher
DOI
10.1016/0029-554x(73)90707-6

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CONTENTS I. Introduction 637 II. Theory of the Stark Effect 638 1. The Stark Effect in a Constant Electric Field 638 2. The Stark Effect in Alternating Electric Fields 640 III. The Study of the Stark Effect in a Constant Electric Field 643 1. Observation of the Shifts of Centers of Gravity of Absorption Lines in Atomic Beams 643 2. Study of the Stark Effect by Observation of Electric Double Refraction 644 3. Study of the Stark Effect by the Method of Comparison with Hyperfine Splitting 646 4. Observation of the Stark Effect by Radiospectroscopic Methods 646 5. Study of the Stark Effect by the Method of Double Radiooptical Resonance 647 6. Observation of the Stark Effect by Level-crossing and Beat Methods 649 IV. The Study of the Stark Effect in Fields of Optical Frequency 651 1. Observation of Shifts and Splittings of Levels of the Ground State of Hg 199 by Resonance Light 651 2. Observation of Shifts and Splittings of Levels of Potassium Atoms in the Radiation Field of a Ruby Laser 653 V. Conclusion 654 Literature Cited 656

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Lambda-doublet specificity in the low-temperature capture of NO(X Π21/2) in low rotational states by C+ ions

Marcis P. Auzinsh, E. I. Dashevskaya, I. Litvin +2 more

Following our general approach to Lambda-doubling specificity in the capture of dipolar molecules by ions [M. Auzinsh et al., J. Chem. Phys. 128, 184304 (2008)], we calculate the rate coefficients for the title process in the temperature range 10(-4)<T<10(2) K. Three regimes considered are as follows: (i) nonadiabatic capture in the regime of high-field Stark effect with respect to the Lambda-doubling components, (10(-1)<T<10(2) K), (ii) adiabatic capture in the regime of intermediate Stark effect (10(-3)<T<10(-1) K), and (iii) adiabatic capture in the limit of very low temperatures (T<<10(-3) K) in the regime of quadratic Stark effect with respect to the Lambda-doubling and hyperfine components. The results predict a high specificity of the capture rates with respect to the Lambda-doublet states even under conditions when the collision energy of the partners strongly exceeds the Lambda-doubling splitting.

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An Improved Experiment to Determine the ‘Past of a Particle’ in the Nested Mach–Zehnder Interferometer

Alon Ben-Israel, Lukas Knips, Jan Dziewior +4 more

We argue that the modification proposed by Li et al. [Chin. Phys. Lett. 32 (2015) 050303] to the experiment of Danan et al. [Phys. Rev. Lett. 111 (2013) 240402] does not test the past of the photon as characterized by local weak traces. Instead of answering the questions: (i) were the photons in A? (ii) were the photons in B? and (iii) were the photons in C? the proposed experiment measures a degenerate operator answering the questions: (i) were the photons in A? and (ii) were the photons in B and C together? A negative answer to the last question does not tell us if photons were present in B or C. On the other hand, a simple variation of the proposal by Li et al. does provide conceptually better evidence for the past of the pre- and post-selected photon, but this evidence will be in agreement with the results of Danan et al.

arXiv:1701.04109•Chinese Physics Letters•Feb 1, 2017•19 citations
CONTENTS I. Introduction 637 II. Theory of the Stark Effect 638 1. The Stark Effect in a Constant Electric Field 638 2. The Stark Effect in Alternating Electric Fields 640 III. The Study of the Stark Effect in a Constant Electric Field 643 1. Observation of the Shifts of Centers of Gravity of Absorption Lines in Atomic Beams 643 2. Study of the Stark Effect by Observation of Electric Double Refraction 644 3. Study of the Stark Effect by the Method of Comparison with Hyperfine Splitting 646 4. Observation of the Stark Effect by Radiospectroscopic Methods 646 5. Study of the Stark Effect by the Method of Double Radiooptical Resonance 647 6. Observation of the Stark Effect by Level-crossing and Beat Methods 649 IV. The Study of the Stark Effect in Fields of Optical Frequency 651 1. Observation of Shifts and Splittings of Levels of the Ground State of Hg 199 by Resonance Light 651 2. Observation of Shifts and Splittings of Levels of Potassium Atoms in the Radiation Field of a Ruby Laser 653 V. Conclusion 654 Literature Cited 656
Following our general approach to Lambda-doubling specificity in the capture of dipolar molecules by ions [M. Auzinsh et al., J. Chem. Phys. 128, 184304 (2008)], we calculate the rate coefficients for the title process in the temperature range 10(-4)<T<10(2) K. Three regimes considered are as follows: (i) nonadiabatic capture in the regime of high-field Stark effect with respect to the Lambda-doubling components, (10(-1)<T<10(2) K), (ii) adiabatic capture in the regime of intermediate Stark effect (10(-3)<T<10(-1) K), and (iii) adiabatic capture in the limit of very low temperatures (T<<10(-3) K) in the regime of quadratic Stark effect with respect to the Lambda-doubling and hyperfine components. The results predict a high specificity of the capture rates with respect to the Lambda-doublet states even under conditions when the collision energy of the partners strongly exceeds the Lambda-doubling splitting.
We argue that the modification proposed by Li et al. [Chin. Phys. Lett. 32 (2015) 050303] to the experiment of Danan et al. [Phys. Rev. Lett. 111 (2013) 240402] does not test the past of the photon as characterized by local weak traces. Instead of answering the questions: (i) were the photons in A? (ii) were the photons in B? and (iii) were the photons in C? the proposed experiment measures a degenerate operator answering the questions: (i) were the photons in A? and (ii) were the photons in B and C together? A negative answer to the last question does not tell us if photons were present in B or C. On the other hand, a simple variation of the proposal by Li et al. does provide conceptually better evidence for the past of the pre- and post-selected photon, but this evidence will be in agreement with the results of Danan et al.