Recent experimental investigation of photon-atom scattering processes in the X-ray energy region

It has long been believed that the core-hole lifetime (CHL) of an atom is an intrinsic physical property, and controlling it is significant yet is very hard. Here, the CHL of the $2p$ state of a W atom is manipulated experimentally by adjusting the emission rate of a resonant fluorescence channel with the assistance of an x-ray thin-film planar cavity. The enhanced emission rate is linearly accelerated by the photonic density of states inside the cavity, which can be directly controlled by adjusting the cavity field amplitude through choosing different cavity modes or changing the angle offset in experiment. This experimental observation is in good agreement with the prediction of a developed theoretical model. It is found that the manipulated resonant fluorescence channel can even dominate the CHL. The controllable CHL realized here will facilitate the nonlinear investigations and modern x-ray scattering techniques in the hard x-ray region.It has long been believed that the core-hole lifetime (CHL) of an atom is an intrinsic physical property, and controlling it is significant yet is very hard. Here, the CHL of the $2p$ state of a W atom is manipulated experimentally by adjusting the emission rate of a resonant fluorescence channel with the assistance of an x-ray thin-film planar cavity. The enhanced emission rate is linearly accelerated by the photonic density of states inside the cavity, which can be directly controlled by adjusting the cavity field amplitude through choosing different cavity modes or changing the angle offset in experiment. This experimental observation is in good agreement with the prediction of a developed theoretical model. It is found that the manipulated resonant fluorescence channel can even dominate the CHL. The controllable CHL realized here will facilitate the nonlinear investigations and modern x-ray scattering techniques in the hard x-ray region.

arXiv:2101.11225Physical Review ResearchJul 16, 202117 citations

Status of cross section data for photon scattering by atoms

Lynn D. Kissel, Richard H. Pratt

Jan 1, 19873 citations

Subpicosecond Studies Of Collision-Free Multiple Photon Processes In The Ultraviolet

T. S. Luk, Ulrich A. Johann, Hernan J. Jara +5 more

In recent years a strong interest has developed in the study of the basic coupling mechanisms governing high order multiphoton processes in atomic systems.1 Such interest has been stimulated by the rapid advances in short pulse generation techniques which allow atomic interactions at an intense field strength of the order of atomic field to be studied. Furthermore, good understanding of the highly nonlinear photon interactions is necessary to evaluate the possibility of using multiphoton processes2 as a means to couple energy into excited states emitting in the x-ray region.In recent years a strong interest has developed in the study of the basic coupling mechanisms governing high order multiphoton processes in atomic systems.1 Such interest has been stimulated by the rapid advances in short pulse generation techniques which allow atomic interactions at an intense field strength of the order of atomic field to be studied. Furthermore, good understanding of the highly nonlinear photon interactions is necessary to evaluate the possibility of using multiphoton processes2 as a means to couple energy into excited states emitting in the x-ray region.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIEOct 21, 19862 citations

- Scattering

Alastair I. M. Rae, Jim Napolitano

In this chapter we discuss the quantum mechanics of the scattering of particles by a fixed object. Scattering is a very important feature of many physical processes and often performs an important role in the process of performing and recording an experimental result. Thus when we perform an x-ray diffraction experiment we record the diffraction pattern created when x-rays are scattered by a crystal, while nearly all the information we possess about the energy levels and structure of nuclei and fundamental particles has been obtained from experiments in which beams of particles (e.g., protons or neutrons) are scattered from targets containing the nuclei or particles under investigation. Indeed, any visual observation we make simply by looking at something involves the detection by our eyes of light scattered from the object we are looking at. It is important therefore that we understand something of the quantum mechanics of the scattering processes, and this will be the aim of the present chapter.In this chapter we discuss the quantum mechanics of the scattering of particles by a fixed object. Scattering is a very important feature of many physical processes and often performs an important role in the process of performing and recording an experimental result. Thus when we perform an x-ray diffraction experiment we record the diffraction pattern created when x-rays are scattered by a crystal, while nearly all the information we possess about the energy levels and structure of nuclei and fundamental particles has been obtained from experiments in which beams of particles (e.g., protons or neutrons) are scattered from targets containing the nuclei or particles under investigation. Indeed, any visual observation we make simply by looking at something involves the detection by our eyes of light scattered from the object we are looking at. It is important therefore that we understand something of the quantum mechanics of the scattering processes, and this will be the aim of the present chapter.

CRC Press eBooksDec 16, 20150 citations

It has long been believed that the core-hole lifetime (CHL) of an atom is an intrinsic physical property, and controlling it is significant yet is very hard. Here, the CHL of the

2p

state of a W atom is manipulated experimentally by adjusting the emission rate of a resonant fluorescence channel with the assistance of an x-ray thin-film planar cavity. The enhanced emission rate is linearly accelerated by the photonic density of states inside the cavity, which can be directly controlled by adjusting the cavity field amplitude through choosing different cavity modes or changing the angle offset in experiment. This experimental observation is in good agreement with the prediction of a developed theoretical model. It is found that the manipulated resonant fluorescence channel can even dominate the CHL. The controllable CHL realized here will facilitate the nonlinear investigations and modern x-ray scattering techniques in the hard x-ray region.