scholarly journals Parallel and antiparallel angular momentum transfer of circularly polarized light to photoelectrons and Auger electrons at the Ni L3 absorption threshold

2018 ◽  
Vol 97 (3) ◽  
Author(s):  
Fumihiko Matsui ◽  
Hiroshi Ota ◽  
Kenji Sugita ◽  
Matthias Muntwiler ◽  
Roland Stania ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Momentum Transfer ◽  
Polarized Light ◽  
Auger Electrons ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Angular Momentum Transfer

scholarly journals Towards New Chiroptical Transitions Based on Thought Experiments and Hypothesis

Symmetry ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 1103
Author(s):  
Takashiro Akitsu ◽  
Sanyobi Kim ◽  
Daisuke Nakane
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Azo Dyes ◽  
Uv Light ◽  
Polarized Light ◽  
Dipole Transition ◽  
Spin Angular Momentum ◽  
Cd Spectra ◽  
Circularly Polarized Light ◽  
Circularly Polarized

We studied supramolecular chirality induced by circularly polarized light. Photoresponsive azopolymers form a helical intermolecular network. Furthermore, studies on photochemical materials using optical vortex light will also attract attention in the future. In contrast to circularly polarized light carrying spin angular momentum, an optical vortex with a spiral wave front and carrying orbital angular momentum may impart torque upon irradiated materials. In this review, we summarize a few examples, and then theoretically and computationally deduce the differences in spin angular momentum and orbital angular momentum depending on molecular orientation not on, but in, polymer films. UV-vis absorption and circular dichroism (CD) spectra are consequences of electric dipole transition and magnetic dipole transition, respectively. However, the basic effect of vortex light is postulated to originate from quadrupole transition. Therefore, we explored the simulated CD spectra of azo dyes with the aid of conventional density functional theory (DFT) calculations and preliminary theoretical discussions of the transition of CD. Either linearly or circularly polarized UV light causes the trans–cis photoisomerization of azo dyes, leading to anisotropic and/or helically organized methyl orange, respectively, which may be detectable by CD spectroscopy after some technical treatments. Our preliminary theoretical results may be useful for future experiments on the irradiation of UV light under vortex.

Differential polarization imaging of sickled cells

1988 ◽  
Vol 46 ◽  
pp. 62-63
Author(s):  
Marcos F. Maestre
Keyword(s):  
Optical Properties ◽  
Theoretical Approach ◽  
Polarized Light ◽  
Polarization Microscopy ◽  
Spectroscopic Techniques ◽  
Polarization Imaging ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Microscopic Scale ◽  
Chiral Structures

Recently we have developed a form of polarization microscopy that forms images using optical properties that have previously been limited to macroscopic samples. This has given us a new window into the distribution of structure on a microscopic scale. We have coined the name differential polarization microscopy to identify the images obtained that are due to certain polarization dependent effects. Differential polarization microscopy has its origins in various spectroscopic techniques that have been used to study longer range structures in solution as well as solids. The differential scattering of circularly polarized light has been shown to be dependent on the long range chiral order, both theoretically and experimentally. The same theoretical approach was used to show that images due to differential scattering of circularly polarized light will give images dependent on chiral structures. With large helices (greater than the wavelength of light) the pitch and radius of the helix could be measured directly from these images.

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