微透镜用于高Tc超导薄膜红外探测器的设计与讨论

通过分析现有的基于在高温超导体超导转变温区的热效应及光子效应的薄膜型器件的结构特 点和光电特性,讨论了利用单片折射型微透镜进行高温超导薄膜红外探测器光电响应性能改 善的可行性,给出了几种典型的可与高温超导薄膜红外探测器耦合的单片面阵硅折射型微透镜阵列的SEM测试结果及主要的几项参数指标。     

激光对反舰导弹红外探测器干扰分析

针对激光对红外制导的反舰导弹干扰问题,建立了激光对反舰导弹红外探测器的干扰链路模型,推导了激光海上传输的大气透过率,计算了1．06μm激光在海上大气传输时仰角、能见度与大气透过率的关系,估算了对不同距离的反舰导弹红外探测器实现有效干扰所需发射的激光能量。     

三光窗杜瓦红外探测器抗干扰设计

文中就斯特林制冷机应用在三光窗杜瓦红外探测器组件中对红外探测器的信号产生的干扰问题进行了多方面探讨、测试及分析研究。从制冷机驱动电源入手 ,研制出了一种低干扰制冷机驱动电源 ,并对整个系统的安装调试进行了抗干扰设计 ,有效地控制了系统对探测器芯片信号产生的干扰 ,使其达到用户要求     

一种新的热红外图像生成方法研究

针对目标与背景热红外辐射特性的描述是否精确将直接影响到红外导引头对目标的发现、识别和跟踪水平，在分析热红外图像再现技术原理的基础上，按照所需再现热图像的灰度分布特征制成相应透射水平的热图底片，提出了一种利用不同透射能力涂层生成热图像的方法。借助热红外图像再现实验和图像相关系数算法，证明该方法能较好地再现目标以及背景的热红外辐射特征和细节。它不仅可用于热红外导引头和热成像仪性能的检测及评估，同时也为军用目标的热红外隐真和示假方法提供了一种新的技术途径。     

不等频两步激发Li蒸汽产生红外受激辐射特性研究

本文首次报道了利用不等频两步激发Li蒸汽,获得了五条红外受激辐射和串级辐射.并对受激辐射特性进行了研究.     

红外小目标与背景辐射对比度的研究

红外目标与背景的对比度特征是红外探测系统检测的重要特征。研究了目标和背景在探测器上的辐射照度,提出了一种红外小目标与背景的辐射对比度,分析了该目标与背景对比度的相关因素。     

IR absorption and surface-enhanced Raman spectra of the isoquinoline alkaloid berberine

We present the IR absorption and surface-enhanced Raman scattering (SERS) spectra of the isoquinoline alkaloid berberine adsorbed on a silver hydrosol and on the surface of a silver electrode for different potentials. Based on quantum chemical calculations, for the first time we have assigned the vibrations in the berberine molecule according to vibrational mode. The effect of the potential of the silver electrode on the geometry of sorption of the molecule on the surface is considered, assuming a short-range mechanism for enhancement of Raman scattering. __________ Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 74, No. 1, pp. 31–36, January–February, 2007.     

Molar extinction coefficients of IR absorption bands of Cu(II) dipivaloylmethanate

IR absorption spectra of an intracomplex chelate compound of Cu(II) bis-dipivaloylmethanate in the spectral range 4000–300 cm⁻¹ are investigated. A comparison is made between the spectra of the complex in different aggregative states: as a solution in heptane and as condensed films. The molar extinction coefficients of absorption bands are calculated. The extinction coefficients found are used to evaluate the thickness of Cu(dpm)₂ films. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 67, No. 1, pp. 34–37, January–February, 2000.     

Calculation of polarized IR absorption spectra for trans-1,4-polyisoprenes of various conformations

Polarized IR spectra for two conformations of trans-1,4-polyisoprene (α-and β-gutta-percha) were calculated. The IR dichroism of the absorption bands was calculated for both conformations. The computed results for polarized IR spectra and IR dichroism agree reasonably well with the respective experiment data. __________ Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 75, No. 4, pp. 470–475, July–August, 2008.     

Tuning the absorption band in the THz range of YBCO films patterned by means of HEHI lithography

High energy heavy ion lithography was used for modulating through implanted nanostructures the local structural and electrical properties of high temperature superconducting YBa₂Cu₃O₇ films. The controlled reduction of the critical temperature of irradiated films results in a localization into heavy ion patterned micro-regions of the electrical dissipation, viable in a given temperature range and driven by ion fluence, bias current and applied magnetic field. The measurement of the response of such nanostructured YBCO films to electromagnetic radiation in the infrared band (MIR–FIR region) is presented. It turns out that the ion induced structural modification of both superconducting film and substrate is actually enabling the infrared optical absorption of YBCO, so that the viability of low noise THz detection above the liquid nitrogen temperature is shown.     

Sectoral thermal emitter for testing of modern IR systems

The paper presents multi-sector stable IR grey body radiation source, that can be used for testing of MRT. Its main element is monolithic metal plate with a test pattern, made of material with high thermal conductivity. On the surface of the test plate the sectors of different emissivity are created during manufacturing process. As a result when viewed by a thermal camera those sectors exhibit thermal contrast depending mainly on the radiative properties of each sector. The value of thermal contrast between particular sectors can be adjusted by changing the temperature of a test plate with respect to ambient. The emissivity values of particular sectors have been calculated and the procedure of adjusting the thermal contrast has been described, as well as the technology used to create the test plate. The model of described emitter has been tested and the results of temperature values obtained from thermal camera were compared with theoretical, calculated figures. The proposed emitter is dedicated for testing and calibrating of modern observations IR systems.     

Simulation of the influence of the polymer conformation,orientation, crystallinity,and stretching on its IR absorption spectrum

Using cis-1,4-polyisoprene as an example, the influence of the conformation and orientation of the polymer chain on its polarization absorption spectra has been simulated. It has been shown that if a change in the orientation of the polymer chain leads to a monotonic change in the intensities of the absorption bands with their maxima positions remaining unchanged, then changes in the polymer chain conformation additionally cause a shift and the appearance of new absorption bands. According to the results of the calculation of the vibrational spectra, the inversion of the IR dichroism of the absorption bands of polymers is associated with the conformation transition. We simulate the influence on the IR absorption spectrum of the degree of crystallinity of cis-1,4-polyisoprene, in which the amorphous and amorphous-crystalline states are considered as a mixture of noninteracting polymer chains, where each state is characterized by a certain ratio of conformers. Likewise, the changes in the IR absorption spectrum of cis-1,4-polyisoprene under its stretching have been investigated. __________ Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 72, No. 6, pp. 727–733, November–December, 2005.     

Molar coefficients of extinction for IR absorption bands of Ni(II) acetylacetonate, ketoiminate, and trifluoroacetylacetonate

We have studied IR absorption spectra (within the spectral range of 4000-200 cm⁻¹ of the intracomplex chelate compounds Ni(II) bis-acetylacetonate, Ni(II) bis-ketoiminate, and Ni(II) bis-trifluoroacetylacetonate and have given a full interpretation and comparison of the spectra of these compounds in dissolved and solid states. The reasons for the differences in the spectra are discussed. The molar coefficients of extinction for the absorption bands are calculated. Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences, 3, Akad. Lavrent’ev Ave., Novosibirsk, 630090, Russia. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 65, No. 5, pp. 775–780, September–October, 1998.     

In situ investigation of synchrotron radiation damage effect of ancient paintings by time-resolved ED-XAS and IR combined techniques

Advanced synchrotron radiation light is a powerful tool for archaeometry research. However, its applications to precious cultural relics, especially for color painting, have been hindered to some degree due to potential X-ray radiation damage. Compared to inorganic mineral pigments, organic binders in the painting are easier to be damaged by synchrotron radiation X-ray beam. The radiation damage effect of two typical painting samples, pure rabbit skin glue and the mixed sample of rabbit skin glue and zinc white, has been investigated by in situ time-resolved ED-XAS and IR combined techniques. The results show that the radiation damage effect of pure rabbit skin glue is more serious at low X-ray energy (7775 eV). The radiation damage effect of the mixed sample increases significantly due to more X-ray absorption by inorganic pigments. Furthermore, the radiation damage is more serious at the energy near Zn K-edge and is somewhat slight at higher energy (13,054 eV). These damages are more obvious from the point of view of protein secondary structures. The irradiation damage effects increase more rapidly at the beginning and are not linear with the irradiating time. The results indicate that synchrotron radiation damage can be reduced effectively by using X-ray energy far away from the X-ray absorption edge of the major element in the pigments during XRF, XRD and CT experiments, or by using time-resolved techniques such as QXAFS and ED-XAS during XAFS experiments.     

Ab Initio方法研究NO分子红外光谱参数

分子光谱参数是红外辐射计算的基础数据,目前国内还没有类似HITRAN数据库的气体光谱数据库,在国家数值风洞工程的支持下,本文开发了高温空气光谱参数计算代码,目的是为目标红外辐射计算提供支持。NO是高超声速飞行器高温空气流场中的主要化学反应产物之一,其振转能级跃迁产生的辐射处于红外探测器的典型波段。本文基于ab initio计算的NO分子分裂后的分子势和永久偶极矩,计算了NO分子的线强度(温度达到了8000 K);在300 K和3000 K温度下,目前的理论计算结果与HITRAN数据库中的数据符合得非常好;本文还采用窄带模型计算了296 K和2000 K温度下NO分子X²Π_1/2态的吸收系数。目前所用方法可以不借助实验光谱常数,使低振动态和高振动态都得到比HITRAN数据库更多的线位置,可为国家数值风洞目标辐射特性计算提供NO分子高温光谱数据。     

Effect of high foreign-gas pressures on perpendicular and hybrid IR absorption bands for symmetric top molecules

The effect of high foreign-gas pressure (He, Ar, N₂ up to 220 atm and CO₂ up to 90 atm) on the contours of perpendicular and hybrid IR absorption bands for symmetric top molecules has been studied. It has been established that over the entire studied pressure range, the shape of the contours of the perpendicular vibrational bands ν₄ and ν₅ for chloroform, deuterochloroform, and bromoform is stable and changes relatively little as the pressure increases. The effect of collisions on the band contours is estimated by comparing the contours for mixtures of compressed gases with the contours calculated in the approximation of the J-and M-diffusion models. It has been shown that intramolecular perturbation of free rotation by Coriolis forces is the determining factor in formation of the contours of the perpendicular bands, successfully competing with the perturbing effect of the foreign gases, evidence for which comes from the insignificant changes in the shape of the bands as the pressure of the foreign gases increases. __________ Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 74, No. 1, pp. 25–30, January–February, 2007.     

Investigation of warm dense matter using time-resolved X-ray absorption spectroscopy with third- and fourth- generation light sources

The advent of high-power lasers has provided insights into laboratory high energy density (>10¹¹ J/m³) physics. In particular, the properties of warm dense matter (WDM) with temperatures of 10⁴–10⁶ K and near-solid densities is a research area that has garnered significant interest recently. However, owing to the high temperatures and pressures associated with WDM, the measurement of fundamental properties is difficult, and insufficient data has been a significant setback in WDM research. Herein, we review recent developments in time-resolved X-ray absorption spectroscopy with synchrotron and X-ray free electron lasers for WDM research. Various physical properties, such as atomic bonding, electronic structures, electron–phonon coupling, and thermal conductivity of various elements in WDM conditions are investigated via this noble X-ray technique at various time scales from 100 ps to 100 fs.     

Method for assigning absorption bands in IR spectra of polyatomic molecules with respect to internal vibrational coordinates

A method is proposed for assigning absorption bands in IR spectra of polyatomic molecules. An algorithm is developed and a Fortran program is written based on this method. The method is illustrated for the example of the toluene molecule. __________ Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 74, No. 2, pp. 169–173, March–April, 2007.     

Formation of Mo and MoSx nanoparticles on Au(1 1 1) from Mo(CO)6 and S2 precursors: electronic and chemical properties

Mo(CO)₆ can be useful as a precursor for the preparation of Mo and MoS_x nanoparticles on a Au(1 1 1) substrate. On this surface the carbonyl adsorbs intact at 100 K and desorbs at temperatures lower than 300 K. Under these conditions, the dissociation of the Mo(CO)₆ molecule is negligible and a desorption channel clearly dominates. An efficient dissociation channel was found after dosing Mo(CO)₆ at high temperatures (>400 K). The decomposition of Mo(CO)₆ yields the small coverages of pure Mo that are necessary for the formation of Mo nanoclusters on the Au(1 1 1) substrate. At large coverages of Mo (>0.15 ML), the dissociation of Mo(CO)₆ produces also C and O adatoms. Mo nanoclusters bonded to Au(1 1 1) exhibit a surprising low reactivity towards CO. Mo/Au(1 1 1) surfaces with Mo coverages below 0.1 ML adsorb the CO molecule weakly (desorption temperature<400 K) and do not induce C–O bond cleavage. These systems, however, are able to induce the dissociation of thiophene at temperatures below 300 K and react with sulfur probably to form MoS_x nanoparticles. The formed MoS_x species are more reactive towards thiophene than extended MoS₂(0 0 0 2) surfaces, MoS_x films or MoS_x/Al₂O₃ catalysts. This could be a consequence of special adsorption sites and/or distinctive electronic properties that favor bonding interactions with sulfur-containing molecules.     

High-resolution photoemission studies of the interfacial reactivity and interfacial energetics of Au and Cu Schottky barriers on methyl-terminated Si(1 1 1) surfaces

The Schottky junction formation by the stepwise evaporation of gold and copper, respectively, onto methyl-terminated silicon, CH₃-Si(1 1 1), was investigated by synchrotron X-ray photoelectron spectroscopy. During the junction formation process, interface reactions occurred as revealed by the appearance of chemically shifted Si 2p components. Upon deposition of Au, the formation of about one monolayer of gold silicide, SiAu₃, with a Si 2p chemical shift of +0.75(2) eV, was observed. The SiAu₃ floated on top of the growing gold layer. Similarly, for the deposition of Cu, the methyl termination layer was partially disrupted, as indicated by the appearance of a −0.28(2) eV chemically shifted Si 2p component attributable to an interfacial copper silicide phase, SiCu₃. Hence, the termination of the Si(1 1 1) surface by methyl groups did not completely prevent interfacial reactions, but did reduce the amount interfacial reaction products as compared to bare Si(1 1 1)-(7 × 7) surfaces.Electron Schottky barrier heights of 0.78(8) eV (Au) and 0.61(8) eV (Cu) were measured. Within the experimental uncertainty the observed Schottky barriers were identical to those ones obtained on non-passivated, (7 × 7)-reconstructed Si(1 1 1) surfaces. Thus, the modification of the electronic properties of the silicon-metal contact requires the complete absence of interfacial reactions.