Hydrogen negative ion: Semiclassical quantization and weak-magnetic-field effect

1993 ◽  
Vol 48 (1) ◽  
pp. 54-69 ◽  
Author(s):  
P. Gaspard ◽  
Stuart A. Rice
Keyword(s):  
Magnetic Field ◽  
Weak Magnetic Field ◽  
Field Effect ◽  
Magnetic Field Effect ◽  
Negative Ion ◽  
Semiclassical Quantization

scholarly journals Development of Lock-in Based Overtone Modulated MARY Spectroscopy for Detection of Weak Magnetic Field Effects

2020 ◽  
Author(s):  
Marcin Konowalczyk ◽  
Olivia Foster Vander Elst ◽  
Jonathan Storey
Keyword(s):  
Magnetic Field ◽  
Weak Magnetic Field ◽  
Field Effect ◽  
Magnetic Field Effect ◽  
Reaction Yield ◽  
Magnetic Field Effects ◽  
Detection Scheme ◽  
Natural Isotopic Abundance ◽  
Field Effects ◽  
High Modulation

Modulated magnetically altered reaction yield (ModMARY) spectroscopy is a derivative variant of fluorescence detected magnetic field effect measurement, where the applied magnetic field has both a constant and a modulated component. As in many derivative spectroscopy techniques, the signal to noise ratio scales with the magnitude of the modulation. High modulation amplitudes, however, distort the signal and can obscure small features of the measured spectrum. In order to detect weak magnetic field effects (including the low field effect) a balance of the two has to be found. In this work we look in depth at the origin of the distortion of the MARY signal by field modulation. We then present an overtone detection scheme, as well as a data analysis method which allows for correct fitting of both harmonic and overtone signals of the modulation broadened MARY data. This allows us to robustly reconstruct the underlying MARY curve at different modulation depths. To illustrate the usefulness of the technique, we show measurements and analysis of a well known magnetosensitive system of pyrene / 1,3-dicyanobenzene (Py/DCB). The measurements of first (h1) and second (h2) harmonic spectra are performed at different modulation depths for both natural isotopic abundance, and perdeuterated pyrene samples.<br>

Magnetic field effect in photodetachment from negative ion in electric field near metal surface

2011 ◽  
Vol 20 (6) ◽  
pp. 063205 ◽  
Author(s):  
Tian-Tian Tang ◽  
De-Hua Wang ◽  
Kai-Yun Huang ◽  
Shan-Shan Wang
Keyword(s):  
Magnetic Field ◽  
Electric Field ◽  
Metal Surface ◽  
Field Effect ◽  
Magnetic Field Effect ◽  
Negative Ion

scholarly journals Development of Lock-in Based Overtone Modulated MARY Spectroscopy for Detection of Weak Magnetic Field Effects

2020 ◽  
Author(s):  
Marcin Konowalczyk ◽  
Olivia Foster Vander Elst ◽  
Jonathan Storey
Keyword(s):  
Magnetic Field ◽  
Weak Magnetic Field ◽  
Field Effect ◽  
Magnetic Field Effect ◽  
Reaction Yield ◽  
Magnetic Field Effects ◽  
Detection Scheme ◽  
Natural Isotopic Abundance ◽  
Field Effects ◽  
High Modulation

Modulated magnetically altered reaction yield (ModMARY) spectroscopy is a derivative variant of fluorescence detected magnetic field effect measurement, where the applied magnetic field has both a constant and a modulated component. As in many derivative spectroscopy techniques, the signal to noise ratio scales with the magnitude of the modulation. High modulation amplitudes, however, distort the signal and can obscure small features of the measured spectrum. In order to detect weak magnetic field effects (including the low field effect) a balance of the two has to be found. In this work we look in depth at the origin of the distortion of the MARY signal by field modulation. We then present an overtone detection scheme, as well as a data analysis method which allows for correct fitting of both harmonic and overtone signals of the modulation broadened MARY data. This allows us to robustly reconstruct the underlying MARY curve at different modulation depths. To illustrate the usefulness of the technique, we show measurements and analysis of a well known magnetosensitive system of pyrene / 1,3-dicyanobenzene (Py/DCB). The measurements of first (h1) and second (h2) harmonic spectra are performed at different modulation depths for both natural isotopic abundance, and perdeuterated pyrene samples.<br>

The Model for Calculation the Hall Effect Parameter

2004 ◽  
Vol 9 (2) ◽  
pp. 129-138
Author(s):  
J. Kleiza ◽  
V. Kleiza
Keyword(s):  
Magnetic Field ◽  
Field Effect ◽  
Magnetic Field Effect ◽  
Mapping Method ◽  
Sample Thickness ◽  
System Of Nonlinear Equations ◽  
Specific Resistivity ◽  
Conformal Mapping Method ◽  
Effect Parameter ◽  
The Magnetic Field

A method for calculating the values of specific resistivity ρ as well as the product µHB of the Hall mobility and magnetic induction on a conductive sample of an arbitrary geometric configuration with two arbitrary fitted current electrodes of nonzero length and has been proposed an grounded. During the experiment, under the constant value U of voltage and in the absence of the magnetic field effect (B = 0) on the sample, the current intensities I(0), IE(0) are measured as well as the mentioned parameters under the effect of magnetic fields B1, B2 (B1 ≠ B2), i.e.: IE(β(i)), I(β(i)), i = 1, 2. It has been proved that under the constant difference of potentials U and sample thickness d, the parameters I(0), IE(0) and IE(β(i)), I(β(i)), i = 1, 2 uniquely determines the values of the product µHB and specific resistivity ρ of the sample. Basing on the conformal mapping method and Hall’s tensor properties, a relation (a system of nonlinear equations) between the above mentioned quantities has been found.

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