Welcome to Bin Lin's Research Page

ABOUT ME AND MY WORK

I am working with Dr. Gordon Berry in the Experimental Atomic, Molecular and Optical Physics group in the Department of Physics at the University of Notre Dame. I am trying to understand the sextet states in boron-like atoms with the help of the MCHF approach and the beam-foil technique.
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Search for Multiply-excited Sextet States in Oxygen, Fluorine and Neon The theory of atomic structure is well-developed. The non-relativistic Hartree-Fock programs were initiated utilizing the first existing computers to develop our understanding of the excited state energy levels and transition rates for multi-electron atoms. Efficient and accurate relativistic codes were developed much later and were useful more for the electronic structures of heavier multi-electron systems. The theoretical group at Notre Dame, Professors Johnson and Sapirstein (1), are responsible for the latest, and most accurate many body relativistic codes. This work continues today, principally through the research of Professor Johnson and his students. Almost all the atomic energy level and transition rates observed and studied theoretically consist of atomic states where only a single electron is excited from the ground state. Note that this is only precisely true in a 'single-electron' picture, whereas many-body techniques utilize multi-electron configuration to describe a particular excited state. It is still true however, that the dominant part of the wave function is a single-excited state, and all the levels are well below the first ionization limit of the atomic ion being studied. However, in the early 1970s, the technique of fast beam spectroscopy enabled the efficient study of atomic states with more than one electron excited. These multi-excited states typically have energies well above the first ionization limit: most such states can then decay very rapidly (in about 10^-14 seconds) by emitting an electron, and leaving the atom ionized (in the case of an ion, with a charge one unit high). The first fast beam spectroscopy experiments showed that much longer-lived multiply-excited states exist in three-electron system: these states have all three electron spins aligned in the same direction, unlike the paired spins of two of the electrons in the more regular states. This spin change forbids rapid autoionization of one of the electrons, stabilizing the multiply excited state, and allowing the much slower photon emission occurring in typically 10^-8 to 10^-9 seconds. Many results of systems of two and three electrons in multiply-excited spin-aligned states have since been made in the isoelectronic sequences of helium and lithium (in triplet and quartet states respectively). Limited results of the four-electron systems of quintet states have been studied in beryllium isoelectronic sequence up to and including neon. However, almost no data have been observed in the five-electron sequence. The data that have been observed have many problems due to blending with strong transitions in other ionic states. One drawback of fast-beam spectroscopy utilizing solid carbon foils is excitation of several ionic charge states at the same time. One method of helping the spectroscopic analysis is to utilize a separate but different excitation method. Professor Berry has been investigating the method of slow beam electron transfer and excitation utilizing gas targets at the University of Lyon. In these experiments, only a single (or sometimes 2) charge state is excited. Thus the spectra are cleaner, and identification is simpler. This type of excitation does not produce the spin-aligned states discussed above. Hence, this technique can only be used in tandem with the foil excitation experiments to help identify the transitions causing blending problems, and verify that the transitions of interest have been correctly identified.
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WORK TO BE DONE Multi-configuration calculations of the sextet states in the boron isoelectronic sequence with identification of the observable transitions {mainly n=2-3 and n=3-3 transitions}. (done) Fast-ion spectroscopy measurements in neon and fluorine at Laval University, Canada. Fast-ion spectroscopy measurements in fluorine and oxygen at the University of Liege, Belgium Slow charge exchange measurements at the University of Lyon. Data analysis and further calculations at the University of Notre Dame.
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REPORTS AND PUBLICATIONS Short To 1959 Å Tunable Coherent Radiation In ß-BBO Crystals, Bin Lin, Zuyan Xu, at al, internal research report, July 1989. Didital Simulation of X-Ray Propagation Process in Plasma, Yingjun Li, Bin Lin, Yuquan Zhang and Hansheng Peng, Computational Physical Letters, May 1997. Finite Time Convergence and Chaotic Control of Periodic Perturbations, J. M. Mao, Y. X. Cheng, B. Lin, at al, internal research report, July 1996. Pseudo-Continuous Bands in Soft X-Ray Spectra from Laser-Irradiated Highly Ionized ⁷⁴W Plasma, Bin Lin, Yuqing Zhou, Baohan Zhang, Guohong Yang, Jun Li and Wu Kang, High Power Laser and Particle Beams, Vol. 8, No. 2, May 1996. Synthetically Training and Enhancing the Qualities Of Graduates, Bin Lin, Exploration and Practice, November 1997. Work Present, Profit Future, Bin Lin, Ruilan Chen, Academic Degree And Graduate Thesis Collection, July 1997. Ways To Do Well In Job Assignment On Graduation, Bin Lin, Academic degree and graduate thesis collection, July 1996. Professor Guangzhao Zhou Had an Informal Discussion With Graduates On The Value Of Life, Bin Lin, Graduate Study Letters, Vol. 3, January 1996. The Activities of Graduate English Club, Bin Lin, Graduate Study Letters, Vol. 21, November 1996. How Do We Develop Social Practice of Graduates, Bin Lin, Graduate Study Letters, Vol. 5, March 1996. Ways To Run A Physical Dance Training of Graduates, Bin Lin, Graduate Study Letters, Vol. 10, December 1995. Analysis of The Results of The Health Check Of Graduate Students, Bin Lin, Graduate Study Letters, Vol. 5, March 1996. How To Run A Singing Contest At The Graduate School, Bin Lin, Graduate Study Letters, Vol. 20, October 1995. Professor Side Hu Had an Informal Discussion With Graduates On The Tricks To Learn, Bin Lin, Dawn Letters, November 16, 1996. The 1s2s2p²3s ⁶P -1s2p³3s ⁶S Transitions in O IV, Bin Lin, H. Gordon Berry, Tomohiro Shibata, A. Eugene Livingston, Henri-Pierre Garnir, Thierry Bastin, J. Désesquelles and Igor Savukov, Phys. Rev. A 67, 062507 (2003). 1s2s2p²3p ⁶L -1s2p³3p ⁶P Transitions in O IV, F V and Ne VI, Bin Lin, H. Gordon Berry, Tomohiro Shibata, A. Eugene Livingston, Henri-Pierre Garnir, Thierry Bastin and J. Désesquelles, J. Phys. B: At. Mol. Opt. Phys. 37 (13) 2797-2809 (2004). The 1s2s2p²3s ⁶L -1s2p³3d ⁶D, L=P, D, F Transitions in O IV, Bin Lin, H. Gordon Berry, Tomohiro Shibata, A. Eugene Livingston, Henri-Pierre Garnir, Thierry Bastin and J. Désesquelles, accepted to Physica Scripta (2004). Beam-gas Spectroscopy of Sextet Transitions in O IV, F V and Ne VI, Bin Lin, Tomohiro Shibata, H. Gordon Berry, and Lanlan Lin, arXiv:physics/0403133 v1, Submitted to Phys. Rev. Lett. (2004). Sextet energy Terms and Dipole-electric Transitions in O IV, Bin Lin, H. Gordon Berry, Tomohiro Shibata, A. Eugene Livingston, Henri-Pierre Garnir, Thierry Bastin and J. Désesquelles, in preparation for Phys. Rev. A (2003). Beam-foil spectroscopy of Sextet Terms and Transitions in F V, Bin Lin, H. Gordon Berry, Tomohiro Shibata, A. Eugene Livingston, Henri-Pierre Garnir, Thierry Bastin and J. Désesquelles, in preparation for Phys. Rev. A (2003). Observations of Sextet Transitions in Ne VI, Bin Lin, H. Gordon Berry, Tomohiro Shibata, A. Eugene Livingston, Henri-Pierre Garnir, Thierry Bastin and J. Désesquelles, in preparation for Phys. Rev. A (2003).
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RECENT ACTIVITIES Fast Beam-foil Spectroscopy of the 1s2s2p²3p ⁶L -1s2p³3p ⁶P, L=S, P, D Sextet Transitions in Doubly Excited O IV. Submit to the 2004 Hawaii International Conference on Sciences, Honolulu, Hawaii, January 15 (Thursday) to January 18 (Sunday), 2004. Doubly-excited States on a Saturday Afternoon and Later..., Gordon Berry and Bin Lin, Physics Department, University of Notre Dame, Notre Dame IN 46656 USA, invited talk at 'Spectroscopy of Highly Charged Ions: Not Just the Lights at the End of Accelerators', Sweden, 25-27 September 2003. Fast Beam-foil Spectroscopy of Sextet Transitions in Boron-like Isoelectronic Sequence, poster presented at the 2003 DAMOP Meeting, Boulder, CO, May 20-May 25, 2003. Energies and Lifetimes of Sextet States in Boron-like Isoelectronic Sequence, poster at International Workshop on Atomic Physics Researches at Storage Rings, Lanzhou, Gansu, China, August 14-19, 2002. Experimental and Theoretical Investigations on Doubly Excited States in O IV, F V and Ne VI, a talk at the 2002 DAMOP Meeting, Williamsburg, VA, May 29-June 1, 2002. The 3d-4f Transitions from Laser-Irradiated Highly Ionized ⁷⁴W Plasma, seminar in the Department of Physics, University of Notre Dame, Notre Dame, IN, March, 1999.
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Ph.D. (DIPLOMA AND ITS TRANSLATION) COMPLETED IN AUGUST 2003 Advisor: H. Gordon Berry Dissertation title: Fast Beam-foil Spectroscopy of Sextet Transitions in Doubly Excited O IV and MCHDF Theory along the Isoelectronic Sequences (as shown below in PDF format). Cover, Abstract, Contents, Chapter 1-3, Chapter 4, Chapter 5.1-5.3, Chapter 5.4, Figures in Chapter 5.4, Chapter 5.5-Chapter 6, and References.
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FACULTY AND GRADUATE STUDENTS IN THE ATOMIC PHYSICS GROUP AT NOTRE DAME Gordon Berry - Walter Johnson - Eugene Livingston - Ulyana Safronova - Jonathan Sapirstein - Carol Tanner Andrei Derevianko - Vladimir Dzuba - Vladislav.P.Gerginov - Marianna S. Safronova - Igor Savukov -Aleksey Vasilyev
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HELPFUL LINKS The Web of Science - Citation Databases Science Nature WorldCat - Online catalog of most English libraries in the world. Coherent Laser - Laser Excellence and Innovation Since 1966 Danfysik Particle Accelerator American Physical Society Chemistry/Physics Library HF calculator - Executive Hartree-Fock codes to calculate atomic structure. Download MCHF Code Package - IOP's page for the book Computational Atomic Structure: An MCHF Approach and download the codes. Atomic Physics in WIS Lab - Databases and software for atomic physics Peter's Atomic Database

Last Revised: May 27, 2007 by Bin Lin.

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