Anomalies found in the intensity of $p$-polarized light from concave diffraction gratings have been analyzed terms an interaction between incoming photon and a surface-plasmon resonance grating surface. There is clear evidence for zone gaps dispersion curves which we constructed surface plasmons Al Au. The phenomena reported here may be regarded as manifestations second- possibly higher-order plasmon-grating interactions.

Optical constants of dry films deoxyribonucleic acid (sodium salt calf thymus DNA) have been determined in the 2–82 eV region photon energy. The extinction coefficient k was obtained by transmission measurements on thin metal mesh screens. refractive index n nonabsorbing 2–4 from critical-angle deposited a sapphire semicylinder. To determine value above 4 eV, Kramers-Kronig analysis performed using measured values k. From these optical complex dielectric function ε and energy-loss for...

Optical properties of polystyrene in the form thin films were determined for photon energies between 0.6 and 82 eV from transmission measurements. The results $k$, extinction coefficient, combined with previous experimental soft hard x-ray regions up to 8050 eV. Analyses made on several sum rules optical this unusually wide energy range, including a rule refractive index $n$ derived recently by Altarelli et al. Redistribution oscillator strength corresponding 2.7% total electrons was found...

Optical constants have been obtained for glassy carbon from 0 to 82 eV by means of reflection measurements. The data analyzed analogy with those graphite in terms single electron excitations and collective oscillations the π σ electrons.

The dispersion of surface plasmons at an air-metal interface has been studied experimentally using the method attenuated total reflection. In vicinity plasmon energy curve was found to bend back toward light line instead increasing asymptotically infinite momentum. We conclude that interactions must be characterized by a complete response-function rather than single curve.

Two methods have been used to determine the optical and dielectric properties of liquid water in vacuum ultraviolet. In first, reflectance equilibrium with its vapor at 1°C was measured spectral region from 3000 1050 Å for three angles incidence. second, placed against plane surface a transparent semicylinder, which formed one side sealed cell, water–semicylinder interface. Real imaginary parts complex index refraction constant were deduced data Fresnel's equations. Peaks occur 8.3 9.6 eV....

The optical constants of vacuum-evaporated silver films were determined in the wavelength region 2500–3700 Å from reflectance measurements made at various angles incidence. These data obtained to investigate discrepancy between experimental emission studies electron-bombarded thin foils and transition radiation theory when bulk used as input data. about 30% photon intensity peak is removed evaporated are used. also predict accurately resonance absorption found transmission foils.

view Abstract Citations (96) References (48) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Polycyclic Aromatic Hydrocarbons in the Atmospheres of Titan and Jupiter Sagan, Carl ; Khare, B. N. Thompson, W. R. McDonald, G. D. Wing, Michael Bada, Jeffrey L. Vo-Dinh, Tuan Arakawa, E. T. PAHs are important components interstellar medium carbonaceous chondrites, but have never been identified reducing atmospheres outer solar system. Incompletely characterized...

The optical properties of polyethylene, obtained from transmission measurements on thin films, are presented for photon energies 0.5 to 76 eV. results the extinction coefficient combined with calculated values in soft and hard X-ray regions, both their internal consistency data previously polystyrene verified through a sum rule calculation. Based these data, mean excitation energy polyethylene is be 62 A model insulator theory, parameters fixed by employed calculate inverse free paths losses...

Optical emission from argon gas excited with alpha particles has been studied to determine if electronic states of long lifetimes are by swiftly moving charged as observed in studies ionization. The spectrum showed a continuum which could be separated into three distinct bands maxima at 1300, 1800, and 2000 Å. light intensity the 2200-Å band was readily quenched addition about 2% CH4, CO2, O2, Kr. 1800-Å more slowly than impurity gases. results support notion that alpha-particle excitation...

The construction and evaluation of an efficient convenient reflection type polarizer, using three gold mirrors, which is useful in the 500–5000-Å wavelength region described. polarizer evaluated both by direct measurement its polarization calculation from measured optical constants gold. variation properties hence investigated for mirrors prepared different workers. With this instrument it possible, over a wide region, to obtain 95% with approximately 15% transmission polarized beam.

A method is presented, well suited to the ultraviolet region, for determining degree of polarization produced by a polarizer at given wavelength and introduced grating monochromator. An analysis made required use in optical studies determine, example, reflectance surface light parallel or perpendicular polarization. Data are spectral region 500 1300 Å gold silver reflection-type polarizers used Seya geometry.

A new soft x-ray spectrometer designed for use with photon excitation from synchrotron light sources is described and characterized. Special design features, including a close-spaced input slit, large toroidal gratings, two-dimensional charge-coupled-device array based detector system, provide exceptional measuring efficiency in 5-m Rowland circle design. Descriptions are given of the spectrometer’s mechanical design, calibration alignment procedures. The beam line providing source...

Photoacoustic observation of nonradiative decay surface plasmons was made on the excited at a silver-air interface by attenuated-total-reflection method. Analysis in conjunction with simultaneously measured optical absorptance data allowed us to separate radiative and relaxations determine their relative probabilities.

The optical properties of Kapton type H polyimide film, obtained from reflectance measurements, are presented for photon energies 0.5 to 70 eV. Equations the energy-loss function, with parameters fixed by data, employed calculate mean free paths and stopping powers low-energy electrons (100 eV 10 keV) in Kapton. values show good agreement those predicted recently proposed analytical formulae electron solid organic insulators.

Optical constants of Na and Li in the form evaporated thick solid films have been determined between 0.6 3.8 eV by ellipsometry. Measurements were made at room temperature through quartz substrate quartz-metal interface. The optical conductivity agrees well with earlier data Smith, while that exhibits considerable differences from results Mathewson Myers. parameters nearly-free-electron model derived real part dielectric function, compared previous data.

The ${L}_{23}$ soft-x-ray emission (SXE) and absorption (SXA) edges have been measured. SXE were measured at temperatures between 85 380 K, analyzed to obtain edge positions widths. widths increased from ${\ensuremath{\Gamma}}_{\mathrm{SXE}}=100$ meV K 150 320 180 above the melting point K. Both SXA 100 with same spectrometer, data values of (${\ensuremath{\Gamma}}_{\mathrm{SXE}}=100$ ${\ensuremath{\Gamma}}_{\mathrm{SXA}}=64$ meV), many-body peaking parameter...

Near-normal incidence-reflectance data on vacuum-evaporated white tin films, produced in situ, are presented for incident photon energies from 2.1 to 14.5 eV. In addition, the real part of refractive index has been measured 20.5 eV by critical-angle method. These results combined with previously published films and an analysis optical is carried out 0.1 27.5 Separation dielectric constants into contributions due free bound electrons indicates interband transitions at...