Application of mid-infrared free-electron laser for structural analysis of biological materials

2021 ◽  
Vol 28 (1) ◽  
pp. 28-35
Author(s):  
Takayasu Kawasaki ◽  
Heishun Zen ◽  
Kento Ozaki ◽  
Hironari Yamada ◽  
Kazumasa Wakamatsu ◽  
...  
Keyword(s):  
Structural Analysis ◽  
Free Electron ◽  
Free Electron Laser ◽  
Structural Changes ◽  
Far Infrared ◽  
Biological Materials ◽  
Infrared Region ◽  
Photon Absorption ◽  
Mid Infrared ◽  
Structural Evaluation

A mid-infrared free-electron laser (MIR-FEL) is a synchrotron-radiation-based femto- to pico-second pulse laser. It has unique characteristics such as variable wavelengths in the infrared region and an intense pulse energy. So far, MIR-FELs have been utilized to perform multi-photon absorption reactions against various gas molecules and protein aggregates in physical chemistry and biomedical fields. However, the applicability of MIR-FELs for the structural analysis of solid materials is not well recognized in the analytical field. In the current study, an MIR-FEL is applied for the first time to analyse the internal structure of biological materials by using fossilized inks from cephalopods as the model sample. Two kinds of fossilized inks that were collected from different strata were irradiated at the dry state by tuning the oscillation wavelengths of the MIR-FEL to the phosphoryl stretching mode of hydroxyapatite (9.6 µm) and to the carbonyl stretching mode of melanin (5.8 µm), and the subsequent structural changes in those materials were observed by using infrared microscopy and far-infrared spectroscopy. The structural variation of these biological fossils is discussed based on the infrared-absorption spectral changes that were enhanced by the MIR-FEL irradiation, and the potential use of MIR-FELs for the structural evaluation of biomaterials is suggested.

The Radiation Beamline of Novosibirsk Free-Electron Laser Facility Operating in Terahertz, Far-Infrared, and Mid-Infrared Ranges

2020 ◽  
Vol 10 (6) ◽  
pp. 634-646
Author(s):  
Vitaly V. Kubarev ◽  
Gennady I. Sozinov ◽  
Mikhail A. Scheglov ◽  
Alexander V. Vodopyanov ◽  
Alexander V. Sidorov ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Far Infrared ◽  
Mid Infrared ◽  
Laser Facility

scholarly journals Hybrid (Oscillator-Amplifier) Free Electron Laser and New Proposals

2021 ◽  
Vol 11 (13) ◽  
pp. 5948
Author(s):  
Andrea Doria
Keyword(s):  
Electric Field ◽  
Free Electron ◽  
Free Electron Laser ◽  
Radiation Source ◽  
Far Infrared ◽  
Infrared Region ◽  
Transverse Magnetic ◽  
Radiation Emission ◽  
Magnetic Undulator ◽  
Strong Radiation

The present work analyses a hybrid free electron laser (FEL) scheme where the oscillator is based on a radiation source operating with a slow-wave guiding structure as, for instance, a Cerenkov FEL or a Smith–Purcell FEL. Such devices, often running in transverse magnetic (TM) modes, present a longitudinal electric field which can easily affect the longitudinal electrons’ velocities, inducing an energy modulation on the beam. Such a modulation, properly controlled, can induce a strong radiation emission in a magnetic undulator properly designed to operate as a radiator. General considerations will be exposed together with a practical numerical example in the far infrared region of the spectrum.

A high-temperature Fourier transform infrared study of the interlayer and Si–O-stretching region in phengite-2M1

Clay Minerals ◽  
2002 ◽  
Vol 37 (2) ◽  
pp. 323-336 ◽  
Author(s):  
M. Mookherjee ◽  
S. A. T. Redfern
Keyword(s):  
High Temperature ◽  
Bond Length ◽  
Structural Changes ◽  
Far Infrared ◽  
Infrared Region ◽  
Thermal Dependence ◽  
Infrared Study ◽  
Mid Infrared ◽  
Infrared Measurements ◽  
Bond Strain

AbstractA natural phengite-2M1 of composition (K0.95Na0.05)(Al0.76Fe0.14Mg0.10)2 (Si3.25Al0.75)O10(OH1.96F0.04) [a= 5.2173(1) Å, b= 9.0493(2) Å, c= 19.989 (1) Å and β = 95.734(4)°] was studied using in situ high-temperature FTIR. Correlations to structural changes were made using previously-reported neutron diffraction data from the same sample. Correlations have been made between the microscopic atomic displacements (arising from thermal effects) and analogous macroscopic properties, such as bond strain and ditrigonal distortions. Spectra were collected in the far-infrared region to study the behaviour of the interlayer (K+) cation and also in the mid-infrared region to distinguish the Si–O stretching modes. We found anisotropic thermal expansion of the interlayer site. The K O bond length is divided into K Oouter and K Oinner, and the K–Oinner bond length is correlated with the far-infrared spectra. The thermal dependence of the correlation between K–O bond length and corresponding far-infrared stretching frequency is different from the effect of the chemical composition. We also found that the K–O bond strain could be successfully resolved into the sum of inner strain and lattice strain. The Si–O stretching mode, obtained from the mid-infrared measurements, showed only weak changes. However, the neutron refinement data showed different thermal behaviour for distinct crystallographic T-sites.

FAR INFRARED FREE ELECTRON LASER

1983 ◽  
Vol 44 (C1) ◽  
pp. C1-385-C1-385
Author(s):  
E. D. Shaw ◽  
R. M. Emanuelson ◽  
G. A. Herbster
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Far Infrared

scholarly journals Two - Color Mid-Infrared Spectroscopy of Isoelectronic Centers in Silicon

2003 ◽  
Vol 770 ◽  
Author(s):  
N.Q. Vinh ◽  
T. Gregorkiewicz
Keyword(s):  
Excited States ◽  
Free Electron ◽  
Free Electron Laser ◽  
Materials Science ◽  
Time Resolved ◽  
Mid Infrared ◽  
Semiconductor Physics ◽  
Open Questions ◽  
Time Resolved Photoluminescence ◽  
Tunable Source

AbstractOne of the open questions in semiconductor physics is the origin of the small splittings of the excited states of bound excitons in silicon. A free electron laser as a tunable source of the mid-infrared radiation (MIR) can be used to investigate such splittings of the excited states of optical centers created by transition metal dopants in silicon. In the current study, the photoluminescence from silver and copper doped silicon is investigated by two color spectroscopy in the visible and the MIR. It is shown the PL due recombination of exciton bound to Ag and Cu is quenched upon application of the MIR beam. The time-resolved photoluminescence measurements and the quenching effects of these bands are presented. By scanning the wavelength of the free-electron laser ionization spectra of relevant traps involved in photoluminescence are obtained. The formation and dissociation of the bound excitons, and the small splittings of the effective-mass excited states are discussed. The applied experimental method allows correlation of DLTS data on trapping centers to specific channels of radiative recombination. It can be applied for spectroscopic analysis in materials science of semicondutors.

Free-electron laser studies of direct and indirect two-photon absorption in germanium

1993 ◽  
Vol 70 (26) ◽  
pp. 4146-4149 ◽  
Author(s):  
E. Tuncel ◽  
J. L. Staehli ◽  
C. Coluzza ◽  
G. Margaritondo ◽  
J. T. McKinley ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon

scholarly journals Wavelength Dependence of Poly(p-hydroxystyrene) Ablation by Mid-Infrared Free-Electron Laser

2019 ◽  
Vol 32 (2) ◽  
pp. 189-193
Author(s):  
Minoru Toriumi ◽  
Takayasu Kawasaki ◽  
Mitsunori Araki ◽  
Takayuki Imai ◽  
Koichi Tsukiyama
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Wavelength Dependence ◽  
Mid Infrared
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