Institute of Atomic and Molecular Physics, Jilin University 2016, Volume 11, Number 1

Location
Jilin University
2699 Qianjin Street,Changchun, China
Further Information: http://iamp.jlu.edu.cn/

Key Contact
Prof. Dajun Ding
Director, Institute of Atomic and Molecular Physics
Tel: 86 431 85168819
E-mail: dajund@jlu.edu.cn

Overview
Established in 1979 authorized by The State Ministry of Education, China,the Institute of Atomic and Molecular Physics (IAMP) is the first institution for graduated education and research in atomic and molecular physics in China. NowadaysIAMP has become a center of innovative science and technology forultrafast intense laser interaction with matters, structural and dynamic theory of atoms and molecules, quantum manipulation of atomic and molecular processes, and material physics under extreme high pressure. IAMP belongs to the Faculty of Physical Sciences of Jilin University, and is located at the main campus of the university in Hi-Tech Development Zone of Changchun City.

Research Foci
●  Ionization in Intense Laser Fields: Developing and utilizing laser manipulation techniques and coincidence measurement, The ionization of atoms/molecules in ultrafast intense laser fields with peak intensity up to 1016 Wcm-2 is investigated to reveal important quantum effectsin strong-field physical processes. With aligned/orientated molecules through nonadiabatic excitation of rotational state selected molecules enables us to give clear pictures for wavepacket dynamics and multi-orbital contribution in laser-matter interaction.
●  Strong Field Theory: Developing new computationalapproaches, including time-dependent quantum Monte Carlo method, time-dependent density functional theory and multi- configuration time-dependent Hartree?Fock method,for simulating the interaction of multi-electrons atoms/molecules with intense lasers. The group uses these methods in the studies on the above threshold ionization and high-order harmonic generation of atoms/ molecules for the understanding of the electronic correlation effects in strong field physics.
●  Ultrafast Spectroscopy under High Pressure: The high pressure as extreme condition plays an important role in excited molecular systems in liquid phase. Indeed, ultrafast time resolved spectroscopy has been recognized to be a powerful tool for these studies. The high pressure ultrafast time resolved spectroscopy is significant basic physics research and has  potential and promising applications in green chemistry, photoelectric conversion materials, and thecontrol of molecular electron or spin processes, etc.
●  Laser Transmission: During the transmission of femtosecond laser pulses in air, a stable plasma channel called filamentation is formed when the self-focusing due to Kerr effect and defocusingdue to plasma generation reach a dynamical balance. It can find its potential and promising applications in the remote sensing of atmospheric constituents, generation of air laser and air waveguide, rainmaking and lightning protection, etc.
●  Theory on Molecular Interactions: The group focuses on developing the theories on nanoscale interactions, including confinement-induced novel electronic structural properties, and confined interactions of nanomaterials with chemical, biological, and medical systems, aiming at promoting the applications of nanostructured materials in energy-related and chemical, biological, medical, and environmental areas.
●  Coherent Control of Microscopic Dynamics: We utilize two experimental systems. A CEP stabilized laser system has been developed to provide a few-cycle pulse for studying the quantum processes with ultrafast electronic or atomicmotion. The second system is an extreme ultraviolet radiation source based on high harmonic generation with velocity mapping image, enabling us toobtain new insight intoelectronic dynamics and quantum states of atoms and molecules.
●  Dynamics of Open Quantum Systems: The open quantum system lives at the cross of quantum mechanism, quantum information, and quantum control. It is deeply involved with the fundamental theoretical problems, e.g., the transition between the classical and quantum worlds. It also offers physical theory and model to the realization of quantum computing, quantum communication and the manipulation over the atomic and molecular systems.

Recent Projects
●  Ionization in Intense Laser Fields: Neutral high-lying Rydberg states are observed in the interaction of diatomic molecules with 50-fs laser fields both experimentally and theoretically. By comparing the yield of molecules with that of atoms, some quantum features are identified, helpful in understanding the underlying mechanism of this new strongfield process.Combiningthe techniques for accurate orientation of molecules in free-space and pump-probetime-resolved coincident measurement of 3-dimension momentum of charged particles,we are conducting further studies  to explore various molecular multielectron effects in the dynamics both for ionizing electrons and rescattering electrons driven by ultra-short pulsed strong laser fields.
●  Strong Field Theory: We have developed the Bohmian mechanics scheme for exploring the physical mechanism of high-order harmonic generation and above threshold ionization of atom in strong laser fields. Motivated by overcoming the computational difficulty for the solution of time-dependent Schr?dinger equation in coordinate space, the momentum space program has been developed. By utilizing the program, the resonance effect on the above threshold ionization was investigated.
●  Ultrafast Spectroscopy under High Pressure:  Theexperimental system has been developed to describe the ultrafast excited state molecule dynamics in liquid phase under high pressure, especially the intramolecular charge transfer and twist intramolecular charge transfer. Research to be carried out will be the intramolecular and intermolecular excited state proton dynamicsin liquidand phase transition dynamicsunder high pressure. It will help us get insight into the control of high pressure effect over the intramolecular and intermolecular molecule interactions.
●  Laser Transmission: We have successfully described numerically the transmission of femtosecond laser pulses in air. Ongoing research into luminescence emission during the femtosecond laser filamentationwill provide information on the excitation and ionization process of nitrogen and oxygen molecules during ?lamentation, combustion diagnosis of organic fuels,such as ethanol and butane, helping to improve combustion efficiency and reduce pollutant products.
●  Theory on Molecular Interactions: We are committed to the study on modeling and simulating the interactions in complex systems in atomic and molecular physics, surface science, materials science, biology, etc., aiming at revealing their formation/reaction mechanisms, microstructures and novel properties. The related theoretical and methodologies will be further developed, including quantum first-principles theories, molecular dynamics simulations, and QM/MM.
●  Coherent Control of Microscopic Dynamics: We develop the technique to split single laser pulse into a series of laser pulses with different relative intensity, delay, phase, polarization, in order to steer the evolution of quantum system along the whole reaction process. Using this technique, we are able to control the ionization, dissociation or isomerization reactions of molecules, and to control the laser precision micromachining processes.
●  Dynamics of Open Quantum Systems: The speedup adiabatic or nonadiabatic quantum evolution in atomic, molecular and optical systems includesi) the interaction between the intensive laser and atomic or molecular systems, ii) the adiabatic evolution of ultra-cold atomic system, iii) the quantum storage and manipulation via light-matter interaction, iv) the quantum interference in the atomic and molecular spectroscopy.

Cover
The special topic on Potential Physics at a Super τ-Charm Factory provides detailed discussions on important topics in τ-charm physics that will be explored in the future at a possible super-tau-charm factory, which will operate in the 2 GeV to 7.0 GeV energy range. Both theoretical and experimental issues are covered, including extensive reviews of recent theoretical and experimental developments. Among the subjects covered are probes of hadronic states and structure of hadrons, charmed meson and charmed baryon decays, tau physics, and possible new physics search at low energy. This renaissance has been driven in part by the experimental reports of neutral D mixing and the discovery of charmonium-like XYZ states at both B factories and BESIII, and the observation of an intriguing proton-antiproton threshold enhancement and the possibly related X(1835) meson state at BESII.