676 research outputs found
Effect of short range order on electronic and magnetic properties of disordered Co based alloys
We here study electronic structure and magnetic properties of disordered CoPd
and CoPt alloys using Augmented Space Recursion technique coupled with the
tight-binding linearized muffin tin orbital (TB-LMTO) method. Effect of short
range ordering present in disordered phase of alloys on electronic and magnetic
properties has been discussed. We present results for magnetic moments, Curie
temperatures and electronic band energies with varying degrees of short range
order for different concentrations of Co and try to understand and compare the
magnetic properties and ordering phenomena in these systems.Comment: 15 pages,17 postscript figures,uses own style file
Atom lithography with two-dimensional optical masks
With a two-dimensional (2D) optical mask, nanoscale patterns are created for
the first time in an atom lithography process using metastable helium atoms.
The internal energy of the atoms is used to locally damage a hydrofobic resist
layer, which is removed in a wet etching process. Experiments have been
performed with several polarizations for the optical mask, resulting in
different intensity patterns, and corresponding nanoscale structures. The
results for a linear polarized light field show an array of holes with a
diameter of 260 nm, in agreement with a computed pattern. With a circularly
polarized light field a line pattern is observed with a spacing of 766 nm.
Simulations taking into account many possible experimental imperfections can
not explain this pattern.Comment: 5 pages, 4 figure
Sub-hertz frequency stabilization of a commercial diode laser
We report ultra-stable locking of a commercially available extended cavity
diode laser to a vibration-insensitive high finesse Fabry-Perot cavity. A servo
bandwidth of 2 MHz is demonstrated. The absolute stability of the diode laser
after locking is measured with a three-cornered-hat method. The resulting Allan
deviation reaches a level of at 1 s, corresponding to only
0.93 Hz linewidth, even without vibration isolation of the reference cavity.Comment: 9 pages, 3 figure
Attachment-specific speech patterns induce dysphoric mood changes in the listener as a function of individual differences in attachment characteristics and psychopathology
Objectives Early childhood experiences influence cognitive-emotional development, with insecure attachment predisposing to potential psychopathologies. We investigated whether narratives containing attachment-specific speech patterns shape listeners’ emotional responses and social intentions. Design First, 149 healthy participants listened to three narratives characteristic for secure, insecure-preoccupied, and insecure-dismissing attachment. Following each narrative, the wellbeing and interpersonal reactivity as a particular aspect of emotional reactivity of the listener were assessed. Likewise, psychopathological aspects of personality were evaluated. A follow-up study compared 10 psychosomatic patients with a current depressive episode and/or personality disorder with distinct depressive symptoms and 10 age- and gender-matched healthy controls. Methods Effects of narratives on listeners’ mental state were tested with repeated-measures AN(C)OVA. Mediating effects in the listener (attachment characteristics in the context of personality traits) were explored. Narrative effects were compared between patients and controls. Results Listening to insecure attachment narratives reduced wellbeing in controls. Nevertheless, tendency for social interaction was highest following the insecure-preoccupied narrative. Importantly, listeners’ individual attachment characteristics mediated the relationship between wellbeing/interpersonal reactivity following the insecure-preoccupied narrative and levels of psychopathology. Furthermore, compared with healthy participants, patients showed higher emotional reactivity following exposure to the insecure-preoccupied narrative, represented by lower wellbeing and lower estimation of friendliness towards the narrator. Conclusions Exposure to attachment-specific speech patterns can result in dysphoric mood changes. Specifically, the insecure-preoccupied narrative influenced the listeners’ emotional state, which was further mediated by the individual attachment patterns and psychopathological personality characteristics. This deepens the understanding of interpersonal processes, especially in psychotherapeutic settings
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