Browsing Department of Physics by Issue Date

Now showing items 1-20 of 756

C60 submonolayers on the Si(1 1 1)-(7 × 7) surface: Does a mixture of physisorbed and chemisorbed states exist?

Gangopadhyay, Subhashis (Elsevier, 200-09)

We have carried out a combined X-ray photoelectron spectroscopy (XPS), ultraviolet photoelectron spectroscopy(UPS), and scanning tunnelling microscopy (STM) study of the C60-Si(1 1 1) interaction where the XPS/UPS spectrometer ...
Transformation from metallic electron charge density to electron momentum

Mishra, Rashmi Ranjan (Elsevier, 1986-12)

Electron momentum densities (EMD) in Al, V, Cr and Cu metals have been estimated from the metallic electron charge densities by applying the procedure of Burkhardt, Konya and Coulson and March. The procedure has provided ...
Density functional calculation of Compton profiles of metals using phase-space approach

Mishra, Rashmi Ranjan (Elsevier, 1987-12)

Spherically averaged electron momentum densities (EMD) in Al, V and Cu metals have been calculated by using density functional theory in the phase-space approach. Compton profiles, J(q) and expectation values 〈pn〉 have ...
Photophysics of doubly-charged quinine: Steady state and time-dependent fluorescence

Pant, Debi D. (Elsevier, 1990-04)

The quinine dication in aqueous solution (1 N H2SO4) gives two fluorescence lifetimes (τ1 = 2.80 ns and τ2 = 19.36 ns) at ambient temperature. τ2 shows a small increase with an increase in acid concentration between 0.1 N ...
Photophysics of doubly-charged quinine: Steady state and time-dependent fluorescence

Pant, Debi D. (Elsevier, 1990-04)

The quinine dication in aqueous solution (1 N H2SO4) gives two fluorescence lifetimes (τ1 = 2.80 ns and τ2 = 19.36 ns) at ambient temperature. τ2 shows a small increase with an increase in acid concentration between 0.1 N ...
Photophysics of protonated 6-methoxyquinoline: steady state and time-dependent fluorescence

Pant, Debi D. (Elsevier, 1990-11)

Nanosecond time-resolved emission spectroscopy was used to investigate the excited state solute—solvent interaction in 6-methoxyquinoline. A red shift in the emission maximum is observed on excitation at the red edge of ...
Excited state solvation dynamics of 6-methoxyquinoline

Pant, Debi D. (Elsevier, 1991-02)

Steady state and transient studies of 6-methoxyquinoline (6MQ) were undertaken. 6MQ undergoes a large change of dipole moment on excitation. The low energy absorption band Lb does not change in position with solvent polarity ...
Photophysics of quinidine dication in relation to quinine dication and 6-methoxyquinoline monocation

Pant, Debi D. (Elsevier, 1991-10)

Nanosecond time resolved emission spectroscopy was used to investigate the excited state solute-solvent interaction in quinidine dication. The emission spectrum is susceptible to the wavelength of excitation and the viscosity ...
Time resolved fluorescence spectroscopy of quinine sulphate, quinidine and 6-methoxyquinoline: pH dependence

Pant, Debi D. (Elsevier, 1992-03)

The excited state dynamics of quinine sulphate (QS), quinidine (Qd) and 6-methoxyquinoline (6MQ) has been studied as a function of pH in steady state and nanosecond time resolved fluorescence experiments. The solvent ...
Time resolved fluorescence spectroscopy of quinine sulphate, quinidine and 6-methoxyquinoline: pH dependence

Pant, Debi D. (Elsevier, 1992-03)

The excited state dynamics of quinine sulphate (QS), quinidine (Qd) and 6-methoxyquinoline (6MQ) has been studied as a function of pH in steady state and nanosecond time resolved fluorescence experiments. The solvent ...
STM studies on dye molecules embedded in ordered liquid crystal structures and an approach for laser-assisted scanning tunneling microscopy

Dey, Srijata (SPIE, 1993-06)

Scanning tunneling microscopy, although capable of yielding very high resolution on periodic structures, very often provides only moderate resolution on singular features. Our work aims at the use of laser light to improve ...
Photophysics of the dications of cinchonine and cinchonidine

Pant, Debi D. (Elsevier, 1993-11)

Steady state and time-dependent fluorescence studies have been carried out for the dications of cinchonine (C2+) and cinchonidine (Cd2+). A red shift in the emission maximum is observed on excitation at the red edge of the ...
An ultrahigh‐vacuum system for STM studies

Dey, Srijata (AIP, 1994)

An ultrahigh‐vacuum (UHV) system for STM studies is described where a home‐built STM is combined with a novel facility for in situ exchange of samples and tips. Technical details concerning the design of the sample and tip ...
Scanning tunneling microscopy of liquid crystals, perylene‐tetracarboxylic‐dianhydride, and phthalocyanine

Dey, Srijata (AIP, 1994-05)

Scanning tunneling microscopy measurements conducted on pure liquid crystals and liquid crystals in combination with the dyes perylene‐tetracarboxylic‐dianhydride (PTCDA) and phthalocyanine (Pc), all adsorbed on highly ...
Contrast mechanisms in photothermal scanning tunneling microscopy

Dey, Srijata (Springer, 1994-08)

By irradiation of the tunneling junction of a scanning tunneling microscope with intensity-modulated laser light a gap-width modulation due to thermal expansion of tip and sample was produced. Photothermal images were ...
Laser-Assisted Scanning Tunneling Microscopy Studies of Thin Ordered Molecular Layers

Dey, Srijata (Springer, 1995)

The irradiation of the junction of an STM with laser light may give access to the study of resonant effects. Since high laser intensities are required, an active compensation setup, designed to suppress the dominating ...
Scanning tunneling microscopy studies of diazo dye monolayers on HOPG

Dey, Srijata (Elsevier, 1995-05)

We report on scanning tunneling microscopy (STM) studies of monolayers of the diazo dye 4-[4-(N,N-dimethylamino)phenylazo]azobenzene (D2, summation formula C20H19N5) on the basal plane of highly oriented pyrolytic graphite ...
Fourth order nonlinear elastic coefficients of hexagonal close packed lattice

Nair, Sindhu S. (Elsevier, 1996-09)

The expressions for the fourth-order elastic constants of a hexagonal close packed lattice is derived using the sublattice displacements to the second order in strains. These expressions together with the expressions for ...
Higher order elastic constants and generalized Gruneisen parameters of elastic waves and low temperature thermal expansion of gadolinium

Nair, Sindhu S. (Springer, 1996-12)

Expressions for the higher order elastic constants are derived using the sublattice displacements to the second degree in strains. These expressions are used to obtain the higher order elastic constants and their pressure ...
Higher order elastic constants and second pressure derivatives of zirconium

Nair, Sindhu S. (IAEA, 1997)

Expressions for the higher order elastic constants are derived using the sublattice displacements to the second degree in strains. These expressions together with the expressions for the second and third order elastic ...

Now showing items 1-20 of 756

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