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Stanke M, Palikot E, Sharkey KL, Adamowicz L. Benchmark calculations of the 2D Rydberg spectrum of lithium. Mol Phys 2021. [DOI: 10.1080/00268976.2021.1925765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Monika Stanke
- Institute of Physics, Faculty of Physics, Astronomy, and Informatics, Nicolaus Copernicus University, Toruń, PL, Poland
| | - Ewa Palikot
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ, USA
| | - Keeper L. Sharkey
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ, USA
| | - Ludwik Adamowicz
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ, USA
- Interdisciplinary Center for Modern Technologies, Nicolaus Copernicus University, Toruń, PL, Poland
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2
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Li R, Wu Y, Rui Y, Li B, Jiang Y, Ma L, Wu H. Absolute Frequency Measurement of ^{6}Li D Lines with khz-Level Uncertainty. PHYSICAL REVIEW LETTERS 2020; 124:063002. [PMID: 32109124 DOI: 10.1103/physrevlett.124.063002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Accepted: 12/03/2019] [Indexed: 06/10/2023]
Abstract
We report the precision measurement of the absolute frequencies, hyperfine splitting, and 2P fine structure splitting in cold atoms of ^{6}Li. Using the stabilized optical frequency comb and developed heterodyne detection technique, the photon shot-noise limited optical spectroscopy is achieved. The measurement of absolute frequencies of D_{1} lines is reached with an uncertainty of about 1 kHz, which is 1 order of magnitude more accurate than previous measurements. The hyperfine splitting of the D_{1} line and 2P fine structure splitting of ^{6}Li are 26.103 1 (14) and 10 052.780 4 (18) MHz, respectively, in agreement with recent theoretical calculations. Our results could provide a benchmark to test the theory at the higher precision and help to resolve large discrepancies among previous experiments.
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Affiliation(s)
- Rui Li
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, People's Republic of China
| | - Yuelong Wu
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, People's Republic of China
| | - Yang Rui
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, People's Republic of China
| | - Bo Li
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, People's Republic of China
| | - Yanyi Jiang
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, People's Republic of China
| | - Longsheng Ma
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, People's Republic of China
| | - Haibin Wu
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, People's Republic of China
- Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
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3
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Nieddu T, Ray T, Rajasree KS, Roy R, Chormaic SN. Simple, narrow, and robust atomic frequency reference at 993 nm exploiting the rubidium (Rb) 5S 1/2 to 6S 1/2 transition using one-color two-photon excitation. OPTICS EXPRESS 2019; 27:6528-6535. [PMID: 30876236 DOI: 10.1364/oe.27.006528] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Accepted: 02/05/2019] [Indexed: 06/09/2023]
Abstract
We experimentally demonstrate a one-color two-photon transition from the 5S1/2 ground state to the 6S1/2 excited state in rubidium (Rb) vapor using a continuous wave laser at 993 nm. The Rb vapor contains both isotopes (85Rb and 87Rb) in their natural abundances. The electric dipole-allowed transitions are characterized by varying the power and polarization of the excitation laser. Since the optical setup is relatively simple, and the energies of the allowed levels are impervious to stray magnetic fields, this is an attractive choice for a frequency reference at 993 nm, with possible applications in precision measurements and quantum information processing.
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Kumar P, Natarajan V. Precise measurement of hyperfine structure in the 3S 1/2 state of 7Li. Sci Rep 2017; 7:13204. [PMID: 29038442 PMCID: PMC5643324 DOI: 10.1038/s41598-017-13531-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Accepted: 09/25/2017] [Indexed: 12/05/2022] Open
Abstract
We report a precise measurement of hyperfine structure in the 3S1/2 state of the odd isotope of Li, namely 7Li. The state is excited from the ground 2S1/2 state (which has the same parity) using two single-photon transitions via the intermediate 2P3/2 state. The value of the hyperfine constant we measure is A = 93.095(52) MHz, which resolves two discrepant values reported in the literature measured using other techniques. Our value is also consistent with theoretical calculations.
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Affiliation(s)
- Pushpander Kumar
- Department of Physics, Indian Institute of Science, Bangalore, 560012, India
| | - Vasant Natarajan
- Department of Physics, Indian Institute of Science, Bangalore, 560012, India.
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5
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Sansonetti CJ, Simien CE, Gillaspy JD, Tan JN, Brewer SM, Brown RC, Wu S, Porto JV. Absolute transition frequencies and quantum interference in a frequency comb based measurement of the (6,7)Li D lines. PHYSICAL REVIEW LETTERS 2011; 107:023001. [PMID: 21797599 DOI: 10.1103/physrevlett.107.023001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2011] [Indexed: 05/31/2023]
Abstract
Optical frequencies of the D lines of (6,7)Li were measured with a relative accuracy of 5 × 10⁻¹¹ using an optical comb synthesizer. Quantum interference in the laser induced fluorescence for the partially resolved D2 lines was found to produce polarization dependent shifts as large as 1 MHz. Our results resolve large discrepancies among previous experiments and between all experiments and theory. The fine-structure splittings for ⁶Li and ⁷Li are 10052.837(22) MHz and 10053.435(21) MHz. The splitting isotope shift is 0.599(30) MHz, in reasonable agreement with recent theoretical calculations.
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Affiliation(s)
- Craig J Sansonetti
- National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
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6
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Gurian JH, Maeda H, Gallagher TF. Kilohertz dye laser system for high resolution laser spectroscopy. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2010; 81:073111. [PMID: 20687709 DOI: 10.1063/1.3462978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
We have electro-optically sliced the output light of a commercial Coherent Evolution Nd:YLF laser to pump a kilohertz repetition rate nanosecond dye laser system. Simple and highly adjustable, this laser system can easily be used for initial state preparation for ultrafast systems as well as high resolution spectroscopy.
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Affiliation(s)
- J H Gurian
- Department of Physics, University of Virginia, Charlottesville, Virginia 22904-0714, USA.
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7
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Sharkey KL, Bubin S, Adamowicz L. Analytical energy gradient in variational calculations of the two lowest P3 states of the carbon atom with explicitly correlated Gaussian basis functions. J Chem Phys 2010. [DOI: 10.1063/1.3419931] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
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8
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King FW. High-Precision Calculations of the Hyperfine Constants for the Low-Lying Excited 2S States of Be+. J Phys Chem A 2009; 113:4110-6. [DOI: 10.1021/jp8105277] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Frederick W. King
- Department of Chemistry, University of Wisconsin-Eau Claire, Eau Claire, Wisconsin 54702
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9
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Ziegler SL, Bushaw BA. Ultratrace Uranium Fingerprinting with Isotope Selective Laser Ionization Spectrometry. Anal Chem 2008; 80:6029-33. [DOI: 10.1021/ac800764j] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Summer L. Ziegler
- Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352
| | - Bruce A. Bushaw
- Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352
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10
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Yan ZC, Nörtershäuser W, Drake GWF. High precision atomic theory for Li and Be+: QED shifts and isotope shifts. PHYSICAL REVIEW LETTERS 2008; 100:243002. [PMID: 18643580 DOI: 10.1103/physrevlett.100.243002] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2008] [Indexed: 05/26/2023]
Abstract
High-precision results are presented for calculations of the nonrelativistic energies, relativistic corrections, and quantum electrodynamic corrections for the 2 2S, 2 2P, and 3 2S states of Li and Be+, using nonrelativistic wave functions expressed in Hylleraas coordinates. Bethe logarithms are obtained for the states of Be+. Finite mass corrections are calculated with sufficient accuracy to extract the nuclear charge radius from measurements of the isotope shift for the 2 2S-2 2P and 2 2S-3 2S transitions. The calculated ionization potential for Be+ is 146 882.923+/-0.005 cm{-1}.
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Affiliation(s)
- Z-C Yan
- Department of Physics, University of New Brunswick, Fredericton, New Brunswick, Canada E3B 5A3.
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11
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Precision Laser Spectroscopy of Li+ and Neutral Lithium. ACTA ACUST UNITED AC 2008. [DOI: 10.1007/978-3-540-75479-4_7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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12
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Nagy S, Fritioff T, Suhonen M, Schuch R, Blaum K, Björkhage M, Bergström I. New mass value for 7Li. PHYSICAL REVIEW LETTERS 2006; 96:163004. [PMID: 16712224 DOI: 10.1103/physrevlett.96.163004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2005] [Indexed: 05/09/2023]
Abstract
A high-accuracy mass measurement of 7Li was performed with the SMILETRAP Penning-trap mass spectrometer via a cyclotron frequency comparison of 7Li3+ and H2+. A new atomic-mass value of 7Li has been determined to be 7.016 003 425 6(45) u with a relative uncertainty of 0.63 ppb. It has uncovered a discrepancy as large as 14sigma (1.1 microu) deviation relative to the literature value given in the Atomic-Mass Evaluation AME 2003. The importance of the improved and revised 7Li mass value, for calibration purposes in nuclear-charge radii and atomic-mass measurements of the neutron halos 9Li and 11Li, is discussed.
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Affiliation(s)
- Sz Nagy
- Atomic Physics, AlbaNova, Stockholm University, S-10691 Stockholm, Sweden.
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13
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Sánchez R, Nörtershäuser W, Ewald G, Albers D, Behr J, Bricault P, Bushaw BA, Dax A, Dilling J, Dombsky M, Drake GWF, Götte S, Kirchner R, Kluge HJ, Kühl T, Lassen J, Levy CDP, Pearson MR, Prime EJ, Ryjkov V, Wojtaszek A, Yan ZC, Zimmermann C. Nuclear charge radii of 9,11Li: the influence of halo neutrons. PHYSICAL REVIEW LETTERS 2006; 96:033002. [PMID: 16486695 DOI: 10.1103/physrevlett.96.033002] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2005] [Indexed: 05/06/2023]
Abstract
The nuclear charge radius of 11Li has been determined for the first time by high-precision laser spectroscopy. On-line measurements at TRIUMF-ISAC yielded a 7Li-11Li isotope shift (IS) of 25 101.23(13) MHz for the Doppler-free [FORMULA: SEE TEXT]transition. IS accuracy for all other bound Li isotopes was also improved. Differences from calculated mass-based IS yield values for change in charge radius along the isotope chain. The charge radius decreases monotonically from 6Li to 9Li, and then increases from 2.217(35) to 2.467(37) fm for 11Li. This is compared to various models, and it is found that a combination of halo neutron correlation and intrinsic core excitation best reproduces the experimental results.
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Affiliation(s)
- R Sánchez
- Gesellschaft für Schwerionenforschung, D-64291 Darmstadt, Germany
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14
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Ewald G, Nörtershäuser W, Dax A, Götte S, Kirchner R, Kluge HJ, Kühl T, Sanchez R, Wojtaszek A, Bushaw BA, Drake GWF, Yan ZC, Zimmermann C. Nuclear charge radii of 8,9Li determined by laser spectroscopy. PHYSICAL REVIEW LETTERS 2004; 93:113002. [PMID: 15447335 DOI: 10.1103/physrevlett.93.113002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2004] [Indexed: 05/24/2023]
Abstract
The 2s-->3s transition of (6,7,8,9)Li was studied by high-resolution laser spectroscopy using two-photon Doppler-free excitation and resonance-ionization detection. Hyperfine structure splittings and isotope shifts were determined with precision at the 100 kHz level. Combined with recent theoretical work, the changes in the nuclear-charge radii of (8,9)Li were determined. These are now the lightest short-lived isotopes for which the charge radii have been measured. It is found that the charge radii monotonically decrease with increasing neutron number from 6Li to 9Li.
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Affiliation(s)
- G Ewald
- Gesellschaft für Schwerionenforschung, 64291 Darmstadt, Germany
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15
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Yan ZC, Drake GWF. Bethe logarithm and QED shift for lithium. PHYSICAL REVIEW LETTERS 2003; 91:113004. [PMID: 14525421 DOI: 10.1103/physrevlett.91.113004] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2003] [Indexed: 05/24/2023]
Abstract
A novel finite basis set method is used to calculate the Bethe logarithm for the ground 2 (2)S(1/2) and excited 3 (2)S(1/2) states of lithium. The basis sets are constructed to span a huge range of distance scales within a single calculation, leading to well-converged values for the Bethe logarithm. The results are used to calculate an accurate value for the complete quantum electrodynamic energy shift up to order alpha(3) Ry. The calculated 3 (2)S(1/2)-2 (2)S(1/2) transition frequency for 7Li is 27 206.092 6(9) cm(-1), and the ionization potential for the 2 (2)S(1/2) state is 43 487.158 3(6) cm(-1). The 7Li-6Li isotope shift is also considered, and all the results compared with experiment.
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Affiliation(s)
- Zong-Chao Yan
- Department of Physics, University of New Brunswick, PO Box 4400, Fredericton, New Brunswick, Canada E3B 5A3
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