[1] We acquired new thermal emission spectra of oxidized synthetic Martian meteorite-like basalts for comparison to Martian surface spectra acquired by the Mars Global Surveyor Thermal Emission Spectrometer (MGS TES). We find that true thermal emission spectra of the oxidized basalts do not provide good spectral matches to the Martian spectra. By contrast, previous biconical reflectance spectra...

Optical properties of ZnO nanorods (NRs) grown by vapour-liquid-solid (VLS) technique on 4Hp-SiC substrates were probed by cathodoluminescence (CL) measurements at room temperature and at 5 K complemented with electroluminescence. At room temperature the CL spectra for defect related emission intensity was enhanced with the electron beam penetration depth. We observed a variation in defect rela...

Dynamic two-dimensional fluorescence correlation spectroscopy (2D FCS) is presented in the general form. Dynamic 2D FCS evaluates the time correlation function between two wavelength axes when an external perturbation is applied to the sample. It displays the vibronic features with similar time response functions in the synchronous correlation spectrum and the features with different time respo...

We propose a new mechanism for the prompt emission of gamma-ray burst. In our model electrons are continuously accelerated in the post shock region via plasma turbulance. Using Monte Carlo technique, we mimic the 2 order Fermi acceleraion due to plasma turbulance and obtain photon spectra. Since the acceleration balances with the synchrotron cooling, the observed low-energy spectral index is na...

Explicit equations for the calculation of time resolved emission spectra from molecules undergoing collisional vibrational relaxation are presented. The equations describe the changes of the emission spectrum with time, after a delta puke excitation. Alternatively, they can be used to obtain the steady state (frequency resolved) emission spectrum as a function of the pressure of added buffer ga...

We show that the upconversion emission spectra of Tm³⁺ and Yb³⁺ codoped β-NaYF₄-NaYF₄ core-shell nanoparticles can be judiciously modified by means of plasmonic nanocavities. Our analysis indicates that more than a 30-fold increase in conversion efficiency to the UV spectral band can be expected by engineering the NIR absorption and the local density of states. The effect of the nanocavity on t...

The infrared emission spectra of a hydrogen flame and' of a natural gas flame have been compared in the region from 1. 7p. to 24p.. Emission bands have been observed at 1.87p., 2.78p. , 4.37p., 6.20p., and 15p. that a re produced by molecules of H 20 and CO2• Another band at 3.316p. is attributed to methane. From 3.0p. to 3.8p. there are a number of rotational lines, some of which may be produc...

The analysis of the spectra of the noble atmospheric gases, utilizing descrip tive daLa cove ring the photographicall y accessible region, has long indicated the possibili ty of a considerable ex te nsion of most of t hese spectra into the infrared r egion beyond 1.3 microns. Obse r vations of the spectra of krypton a nd a rgo n, in the region be tween 1 and 2 mi crons, have bee n made with a P...

Second order advantage of excitation-emission fluorescence matrix was applied for the simultaneous determination of ibuprofen and caffeine. The proposed method is based on the measurement of the native fluorescence and recording emission spectra of ibuprofen and caffeine in different excitation wavelengths. The mixture of these compounds was resolved by multivariate curve resolution coupled wit...