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Digitale Medien

The extraction of signal to noise values in x-ray absorption spectroscopy : Proceedings of the 4th international conference on synchrotron radiation instrumentation (1992)

Dent, A. J. ; Stephenson, P. C. ; Greaves, G. N.

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 63 (1992), S. 856-858

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ISSN: 1089-7623

Quelle: AIP Digital Archive

Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik

Notizen: The assessment of signal to noise (S/N) values in x-ray absorption spectroscopy is important for a number of reasons. Two methods will be described that remove the signal to give the noise. The first uses polynomials and the second Fourier filtering. Having extracted the noise the signal can then be used to calculate the S/N ratio. The method described operates on a background subtracted spectrum and is quick so it can be done on line in an experimental situation.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1142627

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2

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Studies of nanoscale dynamics using coherent x rays from an x-ray free electron laser (abstract) (invited) : Papers from the 12th National Synchrotron Radiation Instrumentation Conference (2002)

Stephenson, G. Brian

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 73 (2002), S. 1367-1367

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ISSN: 1089-7623

Quelle: AIP Digital Archive

Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik

Notizen: This talk will describe proposed studies of atomic- and nanoscale dynamics in condensed matter which take advantage of the high coherent x-ray flux to be produced by future x-ray free-electron laser (FEL) sources, such as the Linac Coherent Light Source at Stanford. In particular, I will focus on the current status and future prospects for photon correlation spectroscopy using coherent x-rays (XPCS), and the use of the ultrashort pulse structure of the x-ray FEL to observe dynamics into the femtosecond range. © 2002 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1448148

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3

Digitale Medien

Pyrometric temperature controller for million degree per second heating (1990)

Brauer, S. ; Ryan, D. H. ; Ström-Olsen, J. O. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 61 (1990), S. 2214-2219

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ISSN: 1089-7623

Quelle: AIP Digital Archive

Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik

Notizen: A high-power proportional temperature controller, using a fast infrared pyrometer, has been developed to change and control the temperature of metallic ribbon samples with microsecond response. The apparatus provides uniform and controlled heating for time-resolved x-ray scattering studies of structural phase transitions. When high-power pulse heating is used, the system is capable of increasing the sample temperature at rates in excess of 106 K/s, without overshoot and with subsequent control to ±1 K at temperatures as low as 650 K.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1141392

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4

Digitale Medien

A femtojoule calorimeter using micromechanical sensors (1994)

Barnes, J. R. ; Stephenson, R. J. ; Woodburn, C. N. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 65 (1994), S. 3793-3798

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ISSN: 1089-7623

Quelle: AIP Digital Archive

Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik

Notizen: We describe a highly sensitive new type of calorimeter based on the deflection of a "bimetallic'' micromechanical sensor as a function of temperature. The temperature changes can be due to ambient changes, giving a temperature sensor or, more importantly, due to the heat absorbed by a coating on the sensor, giving a heat sensor. As an example we show the results of using the sensor as a photothermal spectrometer. The small dimensions and low thermal mass of the sensor make it highly sensitive and we demonstrate a sensitivity of roughly 100 pW. By applying a simple model of the system the ultimate sensitivity is expected to be of the order of 10 pW. The thermal response time of the cantilever can also be determined, giving an estimate of the minimum detectable energy of the sensor. This we find to be 150 fJ and again from our model, expect a minimum value of the order of 20 fJ.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1144509

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Digitale Medien

Radiation losses due to discontinuities in asymmetric three-layer optical waveguides (1980)

Boyd, T. J. M. ; Moshkun, I. ; Stephenson, I. M.

Springer

Optical and quantum electronics 12 (1980), S. 143-158

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ISSN: 1572-817X

Quelle: Springer Online Journal Archives 1860-2000

Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik

Notizen: Abstract In this paper, the radiation losses caused by film thickness and refractive index discontinuities in asymmetric slab waveguides are examined theoretically. A technique developed by Mahmoud and Beal for dealing with the continuous part of the radiation spectrum is used. Several numerical examples which show the radiation loss for various waveguide configurations are presented and discussed and, where appropriate, comparisons with other related work made. In the case of asymmetric thickness steps, the radiation losses are found to be appreciably higher than those computed for symmetric guides. The radiation losses for guides having the same thickness were found to decrease as the guide thickness increased. Once the TE1 mode become guided, the losses decreased rapidly. However, if the two guides had different thickness then it was found that the losses exhibited a minimum.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00619558

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