Veber Sergey L, Tumanov Sergey V, Fursova Elena Yu, Shevchenko Oleg A, Getmanov Yaroslav V, Scheglov Mikhail A, Kubarev Vitaly V, Shevchenko Daria A, Gorbachev Iaroslav I, Salikova Tatiana V, Kulipanov Gennady N, Ovcharenko Victor I, Fedin Matvey V
International Tomography Center, SB RAS, Novosibirsk 630090, Russia; Novosibirsk State University, Novosibirsk 630090, Russia.
International Tomography Center, SB RAS, Novosibirsk 630090, Russia; Novosibirsk State University, Novosibirsk 630090, Russia.
J Magn Reson. 2018 Mar;288:11-22. doi: 10.1016/j.jmr.2018.01.009. Epub 2018 Jan 12.
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.
描述了新西伯利亚自由电子激光（NovoFEL）用户设施中的电子顺磁共振（EPR）站。它基于X波段（约9 GHz）EPR光谱仪，可在连续波（CW）和时间分辨（TR）模式下运行，每种模式都能检测高功率NovoFEL光（太赫兹和中红外）对所研究自旋系统的直接或间接影响。包括两个抛物面镜、快门、光学斩波器和多模波导在内的光学组件，可使NovoFEL的光直接馈入EPR谐振器。介绍了NovoFEL辐射的特性、EPR实验中使用的波导的传输和保偏特性。概述了使用该装置可进行的实验类型。在大多数实际情况下，施加到样品上的高功率辐射会导致其温度迅速升高（T跳变），这在TR模式下最为明显。尽管这种影响是太赫兹辐射的副产品，但这种热效应是可控的，可有意用于诱导和测量任意样品的瞬态信号。可调谐太赫兹辐射的优点是样品中不存在光致过程，且具有高穿透能力，可快速加热几乎任何样品的大部分区域并诱导强烈的瞬态。已针对两个测试样品对这种太赫兹脉冲T跳变TR EPR光谱进行了预研究，它是所创建装置主要目标的有益补充。
