1,578 research outputs found
EPR of photochromic Mo3+ in SrTiO3
In single crystals of SrTiO_3, a paramagnetic center, characterized by S =
3/2 and hyperfine interaction with an I = 5/2 nuclear spin has been observed in
the temperature range 4.2K-77K by means of EPR. The impurity center is
attributed to Mo3+. No additional line splitting in the EPR spectrum due to the
105K phase transition has been observed. At 4.2K the following spin Hamiltonian
parameters for this impurity ion were obtained: g = 1.9546\pm0.0010 and A =
(32.0\pm0.05)\times10^-4 cm^-1.Comment: 5 pages, 2 figure
Fluorescence for high school students
In a not obligatory series of lessons for high school students in the
Netherlands we discuss the fluorescence aspects of anthracene. These lessons
were developed because HiSPARC (High school Project on Astrophysics Research
with Cosmics) detection of cosmic rays are available for different secondary
schools. With the help of special designed scintillator detection stations,
containing anthracene, cosmic rays can be detected. Fluorescence of anthracene
is one of the topics discussed in these series of extra curricular lessons
aimed at excellent pupils working on cosmic radiation within the HiSPARC -
project.Comment: 14 pages, 13 figures, 5 reference
Dutch corporate liquidity mangement: New evidence on aggregation
In this paper we investigate Dutch corporate liquidity management in general, and target adjustment behaviour in particular. To this purpose, we use a simple error correction model of corporate liquidity holdings applied to firm-level data for the period 1977-1997. We confirm the existence of long-run liquidity targets at the firm level. We also find that changes in liquidity holdings are driven by short-run shocks as well as the urge to converge towards targeted liquidity levels. The rate of target convergence is higher when we include more firm-specific information in the target. This result supports the idea that increased precision in defining liquidity targets associates with a faster observed rate of target convergence. It also suggests that the slow speeds of adjustment obtained in many macro studies on money demand are artefacts of aggregation bias.corporate liquidity demand, precautionary liquidity
Forecasting the money multiplier: implications for money stock control and economic activity
Forecasting ; Money supply
Calculation of the zero-field splitting D and g(perp)parameters in EPR for d3 spin systems in strong and moderate axial fields
Numerical and analytical methods are used to investigate the calculation of
the zero field splitting |2D| and g(perp) parameters in EPR for octahedrally
surrounded d3 spin systems (S = 3/2) in strong and moderate axial crystal
fields (|D|>=h{\nu}). Exact numerical computer calculations are compared with
analytical results obtained from third-order perturbation theory. From the
analyses we conclude that EPR measurements performed at a single frequency with
the magnetic field H at a magic angle {\alpha}_M, where 62deg < {\alpha}_M <
63deg, with respect to the axial crystal field of the d3 spin system, yields an
almost exact solution in third-order perturbation theory. For dual frequency
experiments, i.e. X-K, X-Q and K-Q band experiments, performed with the
magnetic field H at an angle of {\alpha} = 90deg with respect to the axial
crystal field, the ratio h\u{psion}/|2D| has to be smaller than 0.25 in order
to use third order perturbation calculations within an error limit of 0.020% in
the g(perp) values. For values of h\u{psion}/|2D| >= 0.25 one has to proceed
with exact numerical computer calculations. Finally, we conclude that
measurements performed at a single EPR frequency experiment with the magnetic
field H directed along two specific angles with respect to the axial crystal
field of the octahedrally surrounded d3 centre, i.e. {\alpha} = 90deg and
{\alpha} = 35deg16 respectively, third-order perturbation theory gives
non-reliable results for the |D| and g(perp)-values.Comment: 9 pages, 2 figure
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