TY - JOUR

T1 - X-band EPR setup with THz light excitation of Novosibirsk Free Electron Laser

T2 - Goals, means, useful extras

AU - Veber, Sergey L.

AU - Tumanov, Sergey V.

AU - Fursova, Elena Yu

AU - Shevchenko, Oleg A.

AU - Getmanov, Yaroslav V.

AU - Scheglov, Mikhail A.

AU - Kubarev, Vitaly V.

AU - Shevchenko, Daria A.

AU - Gorbachev, Iaroslav I.

AU - Salikova, Tatiana V.

AU - Kulipanov, Gennady N.

AU - Ovcharenko, Victor I.

AU - Fedin, Matvey V.

N1 - Publisher Copyright: © 2018 Elsevier Inc.

PY - 2018/3/1

Y1 - 2018/3/1

N2 - Electron Paramagnetic Resonance (EPR) station at the Novosibirsk Free Electron Laser (NovoFEL) user facility is described. It is based on X-band (∼9 GHz) EPR spectrometer and operates in both Continuous Wave (CW) and Time-Resolved (TR) modes, each allowing detection of either direct or indirect influence of high-power NovoFEL light (THz and mid-IR) on the spin system under study. The optics components including two parabolic mirrors, shutters, optical chopper and multimodal waveguide allow the light of NovoFEL to be directly fed into the EPR resonator. Characteristics of the NovoFEL radiation, the transmission and polarization-retaining properties of the waveguide used in EPR experiments are presented. The types of proposed experiments accessible using this setup are sketched. In most practical cases the high-power radiation applied to the sample induces its rapid temperature increase (T-jump), which is best visible in TR mode. Although such influence is a by-product of THz radiation, this thermal effect is controllable and can deliberately be used to induce and measure transient signals of arbitrary samples. The advantage of tunable THz radiation is the absence of photo-induced processes in the sample and its high penetration ability, allowing fast heating of a large portion of virtually any sample and inducing intense transients. Such T-jump TR EPR spectroscopy with THz pulses has been previewed for the two test samples, being a useful supplement for the main goals of the created setup.

AB - Electron Paramagnetic Resonance (EPR) station at the Novosibirsk Free Electron Laser (NovoFEL) user facility is described. It is based on X-band (∼9 GHz) EPR spectrometer and operates in both Continuous Wave (CW) and Time-Resolved (TR) modes, each allowing detection of either direct or indirect influence of high-power NovoFEL light (THz and mid-IR) on the spin system under study. The optics components including two parabolic mirrors, shutters, optical chopper and multimodal waveguide allow the light of NovoFEL to be directly fed into the EPR resonator. Characteristics of the NovoFEL radiation, the transmission and polarization-retaining properties of the waveguide used in EPR experiments are presented. The types of proposed experiments accessible using this setup are sketched. In most practical cases the high-power radiation applied to the sample induces its rapid temperature increase (T-jump), which is best visible in TR mode. Although such influence is a by-product of THz radiation, this thermal effect is controllable and can deliberately be used to induce and measure transient signals of arbitrary samples. The advantage of tunable THz radiation is the absence of photo-induced processes in the sample and its high penetration ability, allowing fast heating of a large portion of virtually any sample and inducing intense transients. Such T-jump TR EPR spectroscopy with THz pulses has been previewed for the two test samples, being a useful supplement for the main goals of the created setup.

KW - Electron paramagnetic resonance

KW - Free electron laser

KW - NovoFEL

KW - T-jump EPR

KW - THz radiation

KW - CONTINUOUS-WAVE

KW - ESR

KW - HIGH-FIELD

KW - STATE

KW - PARAMAGNETIC-RESONANCE

KW - METHODOLOGY

KW - SPECTROSCOPY

KW - FREQUENCY EPR

KW - SPIN-RESONANCE

KW - MAGNETS

UR - http://www.scopus.com/inward/record.url?scp=85041545988&partnerID=8YFLogxK

U2 - 10.1016/j.jmr.2018.01.009

DO - 10.1016/j.jmr.2018.01.009

M3 - Article

C2 - 29360045

AN - SCOPUS:85041545988

VL - 288

SP - 11

EP - 22

JO - Journal of Magnetic Resonance

JF - Journal of Magnetic Resonance

SN - 1090-7807

ER -