Fractional Stark State Selective Electric Field Ionization of Very High-nRydberg States of Molecules

1996 ◽  
Vol 76 (19) ◽  
pp. 3530-3533 ◽  
Author(s):  
Hans-Jörg Dietrich ◽  
Klaus Müller-Dethlefs ◽  
Leonid Ya. Baranov
Keyword(s):  
Electric Field ◽  
Field Ionization ◽  
Very High

Field-assisted ionization theory for microscopists

1994 ◽  
Vol 52 ◽  
pp. 820-821
Author(s):  
Patrick P. Camus
Keyword(s):  
Electric Field ◽  
Electron Tunneling ◽  
Ionization Probability ◽  
Critical Distance ◽  
Tunneling Probability ◽  
Field Ionization ◽  
Radius Of Curvature ◽  
Field Evaporation ◽  
A Value ◽  
Ion Emission

The theory of field ion emission is the study of electron tunneling probability enhanced by the application of a high electric field. At subnanometer distances and kilovolt potentials, the probability of tunneling of electrons increases markedly. Field ionization of gas atoms produce atomic resolution images of the surface of the specimen, while field evaporation of surface atoms sections the specimen. Details of emission theory may be found in monographs.Field ionization (FI) is the phenomena whereby an electric field assists in the ionization of gas atoms via tunneling. The tunneling probability is a maximum at a critical distance above the surface,xc, Fig. 1. Energy is required to ionize the gas atom at xc, I, but at a value reduced by the appliedelectric field, xcFe, while energy is recovered by placing the electron in the specimen, φ. The highest ionization probability occurs for those regions on the specimen that have the highest local electric field. Those atoms which protrude from the average surfacehave the smallest radius of curvature, the highest field and therefore produce the highest ionizationprobability and brightest spots on the imaging screen, Fig. 2. This technique is called field ion microscopy (FIM).

scholarly journals State-selective electric-field ionization of Rydberg positronium

2018 ◽  
Vol 98 (5) ◽  
Author(s):  
A. M. Alonso ◽  
L. Gurung ◽  
B. A. D. Sukra ◽  
S. D. Hogan ◽  
D. B. Cassidy
Keyword(s):  
Electric Field ◽  
Field Ionization

Thermal Radiative Properties of Vertical Graphitic Petal Arrays

2012 ◽  
Author(s):  
Bhagirath Duvvuri ◽  
Anurag Kumar ◽  
Hua Bao ◽  
Haoxiang Huang ◽  
Timothy Fisher ◽  
...  
Keyword(s):  
Optical Properties ◽  
Electric Field ◽  
Finite Difference Time Domain ◽  
Incident Radiation ◽  
Radiative Properties ◽  
Thermal Radiative Properties ◽  
Fdtd Simulations ◽  
Difference Time ◽  
Graphitic Plane ◽  
Very High

In this work, thermal radiative properties of vertical graphene petal arrays are theoretically and experimentally investigated to show that they are superior absorbers of radiation. Finite difference time domain (FDTD) simulations are first performed to calculate optical properties of vertical graphitic arrays of different configurations, namely, graphitic gratings, periodic graphitic cavities, and random graphitic cavities. The effect of polarization of incident radiation on optical properties of such structures is systematically evaluated. When the incident electric field is parallel to the graphitic plane (S polarization) in graphitic gratings, the absorptance is very high, but the reflectance low but still significant when compared to reflectance from a MWCNT array. On the other hand, when the electric field is polarized perpendicular to the graphitic plane (P polarization), the absorptance is significantly lower, as well as the reflectance. This contrast is due to the stronger optical response for the S polarization. Ordered graphitic petal cavity arrays show optical properties falling between the above two cases because of the presence of both polarizations. The random graphitic petal cavity arrays with various angles of orientation show similar properties with ordered petal arrays, and the simulated reflectance agrees very well with experimental data measured on a fabricated thin graphite petal sample.

Investigation of Even-Parity Highly Excited States of Eu I with Electric Field Ionization Method

2012 ◽  
Vol 32 (2) ◽  
pp. 0230001
Author(s):  
野仕伟 Ye Shiwei ◽  
戴长建 Dai Changjian ◽  
赵艳红 Zhao Yanhong
Keyword(s):  
Electric Field ◽  
Excited States ◽  
Field Ionization ◽  
Ionization Method

Electric Field Ionization of Lithium Atom

2015 ◽  
Vol 35 (6) ◽  
pp. 0602004 ◽  
Author(s):  
马学伟 Ma Xuewei ◽  
马小东 Ma Xiaodong ◽  
戴长建 Dai Changjian
Keyword(s):  
Electric Field ◽  
Lithium Atom ◽  
Field Ionization

scholarly journals A High-Resolution Terahertz Electric Field Sensor Using a Corrugated Liquid Crystal Waveguide

Crystals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 302 ◽  
Author(s):  
Lan-Lan Xu ◽  
Yi Gong ◽  
Ya-Xian Fan ◽  
Zhi-Yong Tao
Keyword(s):  
Liquid Crystals ◽  
Electric Field ◽  
Defect Mode ◽  
High Sensitivity ◽  
Electric Field Sensor ◽  
Significant Performance ◽  
Dc Electric Field ◽  
Field Sensor ◽  
Field Sensing ◽  
Very High

Liquid crystals (LCs) can always reflect variable optical properties in a broad terahertz (THz) band under external electric or magnetic fields. Based on the measurements of these varying properties, we can realize electric and magnetic field sensing with very high sensitivity. Here, we theoretically and numerically demonstrate a type of electric field sensor in the THz frequency range based on the defect mode arising in a periodically corrugated waveguide with liquid crystals. The Bragg defect structure consisting of periodically corrugated metallic walls and a defect in the middle can provide a narrow transmitted peak with controllable bandwidth, which can be used for external field sensing when it is filled with LCs. The molecular orientation of nematic LCs (E7) is not only very sensitive to the applied DC electric field but also very crucial to the effective refractive index of E7. Changing the effective index can efficiently shift the frequency of the transmitted peak in the THz spectrum. The simulated results show that the sensitivity can reach as high as 9.164 MHz/(V/m) and the smallest resolution is 0.1115 V/m. The proposed sensor and its significant performance could benefit electric field sensing and extend the applications of THz technology.

Very-high-n Stark wave packets generated by an electric-field step

1997 ◽  
Vol 55 (2) ◽  
pp. R865-R868 ◽  
Author(s):  
M. T. Frey ◽  
F. B. Dunning ◽  
C. O. Reinhold ◽  
J. Burgdörfer
Keyword(s):  
Electric Field ◽  
Wave Packets ◽  
Very High
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