Magnetic Field Effects on Laser Drilling

2013 ◽  
Vol 135 (6) ◽  
Author(s):  
Chang Ye ◽  
Gary J. Cheng ◽  
Sha Tao ◽  
Benxin Wu
Keyword(s):  
Magnetic Field ◽  
Laser Ablation ◽  
Laser Drilling ◽  
Nanosecond Laser ◽  
Drilling Process ◽  
Magnetic Field Effects ◽  
Drilling Depth ◽  
Field Effects ◽  
Nanosecond Laser Ablation ◽  
The Magnetic Field

A magnetic field-assisted laser drilling process has been studied, where nanosecond laser ablation is performed under an external magnetic field. The study shows that the magnetic field-assisted laser drilling process produces deeper drilling depth and generates more confined plasma plume and relative less residual, as compared with laser drilling without magnetic field. This phenomenon has been rarely reported in the literature. The magnetic field effects on laser ablation have been analyzed analytically and a hypothesized explanation has been proposed based on the effect of the magnetic field on the plasma produced during laser ablation.

scholarly journals LOCAL ORDER AND MAGNETIC FIELD EFFECTS ON THE ELECTRONIC PROPERTIES OF DISORDERED BINARY ALLOYS IN THE QUANTUM SITE PERCOLATION LIMIT

1999 ◽  
Vol 13 (32) ◽  
pp. 3861-3877
Author(s):  
D. F. DE MELLO ◽  
G. G. CABRERA
Keyword(s):  
Magnetic Field ◽  
Electronic Properties ◽  
Binary Alloys ◽  
Finite Size ◽  
Local Order ◽  
Destructive Interference ◽  
Magnetic Field Effects ◽  
Site Percolation ◽  
Field Effects ◽  
The Magnetic Field

Electronic properties of disordered binary alloys are studied via the calculation of the average Density of States (DOS) in two and three dimensions. We propose a new approximate scheme that allows for the inclusion of local order effects in finite geometries and extrapolates the behavior of infinite systems following finite-size scaling ideas. We particularly investigate the limit of the Quantum Site Percolation regime described by a tight-binding Hamiltonian. This limit was chosen to probe the role of short range order (SRO) properties under extreme conditions. The method is numerically highly efficient and asymptotically exact in important limits, predicting the correct DOS structure as a function of the SRO parameters. Magnetic field effects can also be included in our model to study the interplay of local order and the shifted quantum interference driven by the field. The average DOS is highly sensitive to changes in the SRO properties and striking effects are observed when a magnetic field is applied near the segregated regime. The new effects observed are twofold: there is a reduction of the band width and the formation of a gap in the middle of the band, both as a consequence of destructive interference of electronic paths and the loss of coherence for particular values of the magnetic field. The above phenomena are periodic in the magnetic flux. For other limits that imply strong localization, the magnetic field produces minor changes in the structure of the average DOS.

scholarly journals The Magnetic Field Effects on Electrolysis. II. The Anodic Surface Oxidation of Gold

1987 ◽  
Vol 60 (11) ◽  
pp. 4163-4165 ◽  
Author(s):  
Takeshi Watanabe ◽  
Yoshifumi Tanimoto ◽  
Ryoichi Nakagaki ◽  
Mitsuo Hiramatsu ◽  
Tadayoshi Sakata ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Surface Oxidation ◽  
Magnetic Field Effects ◽  
Field Effects ◽  
The Magnetic Field

Magnetic field effects upon photochemistry of bichromophoric chain molecules containing nitroaromatic and arylamino moieties: Elucidation of reaction mechanism and control of reaction yields

1988 ◽  
Vol 66 (8) ◽  
pp. 1989-1996 ◽  
Author(s):  
Ryoichi Nakagaki ◽  
Kiyoshi Mutai ◽  
Mitsuo Hiramatsu ◽  
Hideyuki Tukada ◽  
Saburo Nakakura
Keyword(s):  
Magnetic Field ◽  
Branching Ratio ◽  
Relative Yield ◽  
Field Analysis ◽  
Coupling Mechanism ◽  
Magnetic Field Effects ◽  
Appreciable Change ◽  
Field Effects ◽  
Magnetic Field Analysis ◽  
The Magnetic Field

The photochemistry of bichromophoric species containing nitroaromatic and arylamino moieties has been studied in the presence and absence of an external magnetic field. Photolysis products are an unsubstituted arylamine, a nitrosoaromatic species (Product 1), and a nitroaromatic compound (Product 2). On application of the magnetic field, the formation yield for Product 1 decreases and that for Product 2 correspondingly increases, whereas the consumption of the starting material and the release of the unsubstituted arylamine are independent of the magnetic field. Analysis of the magnetic field effects shows that the hyperfine coupling mechanism predominates and that the photoreaction takes place in the triplet manifold of the nitroaromatic moiety. Application of the magnetic field may cause an appreciable change in the relative yield of cage and escape products, i.e., the branching ratio of competitive processes.

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