Randika Dodangodage

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• Doctor of Philosophy
• PostDoc Position at Old Dominion University

Propene infrared absorption cross-sections are important for quantitative analysis of atmospheric spectra. Propene has been observed in Titan's atmosphere and may be detected in the atmospheres of giant planets. Infrared absorption cross-sections of propene (C3H6) have been measured in the 2680-3220 cm⁻¹ region by high-resolution Fourier transform...

Atmospheric hydrofluorocarbon (HFC) abundances are increasing rapidly because of the Montreal Protocol phase-out of the production and consumption of chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs). HFC-32 (CH2F2, difluoromethane) mole fractions (volume mixing ratios, VMRs) have been retrieved from infrared absorption spectra record...

HOCl is a chlorine reservoir molecule found in the stratosphere and in the marine boundary layer. In the stratosphere, it originates from anthropogenic emissions of long-lived chlorine-containing molecules as chlorofluorocarbons (CFCs). HOCl is also a key species in polar ozone destruction and the formation of the Antarctic ozone hole. A new HOCl r...

The infrared absorption cross sections of ethane (C2H6) have been measured in the 3.3 μm region by high resolution Fourier transform spectroscopy. The ethane samples had temperatures of 203, 233, 263, 295 K with broadening gas pressures of 10 Torr, 30 Torr and 100 Torr of hydrogen or helium. These cross sections are useful for the interpretation of...

Infrared absorption spectra of neopentane, 2,2-dimethylpropane, C(CH3)4, were recorded in the 2550-3350 cm⁻¹ region by high resolution Fourier transform spectroscopy at the Canadian Light Source (CLS). Absorption cross sections were obtained for pure samples and with nitrogen as a broadening gas for 4 temperatures (202, 232, 265, 297 K).

LaO bands are found in the spectra of cool S-type stars. The bands of the A ² Π–X ² Σ ⁺ transition with v ′ ≤ 3 and v ″ ≤ 4 are rotationally analyzed, providing spectroscopic constants for the A ² Π state. Line strengths are calculated using an ab initio transition dipole moment function, and radiative lifetimes for the A ² Π state have also been c...

LaO bands are a characteristic feature in the spectrum of cool S-type stars. La is made primarily by the s-process during the asymptotic giant branch phase of stellar evolution. The B 2 Σ +-X 2 Σ + and A 2 Π-X 2 Σ + band systems can be used to determine the La abundances in cool S stars. The bands of the B 2 Σ +-X 2 Σ + with ¢ v and ¢¢  v 5 have b...

The infrared absorption cross sections of pure n-butane, n-pentane, cyclopentane and cyclohexane have been measured in the 3.3 µm region (and 6.8 µm region for cyclopentane) by high resolution Fourier transform spectroscopy. The samples had temperatures of 294 K and 230 K for n-butane, 294 K and 218 K for n-pentane, 296 K and 235 K for cyclopentane...

LaO bands appear in the optical spectra of S-type stars. The formation of the elements can be studied by measuring the stellar abundances of heavy metals such as La. For cooler stars, the visible and near-infrared electronic transitions of LaO are more useful than La atomic lines. We have analyzed the LaO B 2 Σ +-X 2 Σ + band system up to v=5 in bo...

In the paper Štefaňák et al (2010 Phys. Scr. T 140 014035) have proved that for any four-state quantum walk, there cannot be cycles longer than two steps. Our investigations reveal that they have not used the most general form of characteristic polynomials in their proof. Consequently, the result is not generally valid and hence there can be quantu...

Recurrence in classical random walks is well known and the idea has been investigated in quantum walks in many aspects. The recurrence in quantum walks is termed when the walker returns to the origin with a nonzero probability and if the final coin state is also the same as the initial coin state then the quantum walk is said to have a full revival...