for processing single-shot positron annihlation lifetime spectrscopy
Project description
# sspals
python tools for analysing single-shot positron annihilation lifetime spectra
## Prerequisites
Tested using Anaconda (Continuum Analytics) with Python 2.7 and 3.5.
Package dependencies:
* scipy
## Installation
via pip (recommended):
```
pip install sspals
```
alternatively, try the development version
```
git clone https://github.com/PositroniumSpectroscopy/sspals
```
and then run
```
python setup.py install
```
## About
Single-shot positron annihilation lifetime spectroscopy (SSPALS) [Ref. 1]
essentially consists of studying the number of annihilation gamma-rays
measured as a function of time following implantation of a time-focused
(~5 ns) positron bunch into a solid target material.
For certain materials a significant fraction of the positrons (~ 30%) will
bind to electrons to form positronium (Ps), which can then be re-emitted
to vacuum. Ps has a characteristic mean lifetime of 142 ns in vacuum, which
makes it relatively easy to identify in SSPALS spectra.
This package includes a handful of useful tools for working with SSPALS data.
The two main functions are used to: (i) combine data split across hi/ low
gain channels of a digital oscilloscope, and (ii) to estimate the amount of
Ps formed using the so-called delayed fraction.
*sspals.chmx(hi, low)*
> Remove zero offset from hi and low gain data, invert and splice
together by swapping saturated values from the hi-gain channel
for those from the low-gain channel. Apply along rows of a 2D array.
*sspals.sspals(arr, dt, limits=[A, B, C])*
> Calculate the trigger time t0 (using a cfd) and the delayed fraction (DF)
(integral B->C / integral A->C) for each row of a 2D array. Return a pandas
DataFrame [(t0, AC, BC, DF)].
Raw data (hi, low) is expected to be 2D arrays of repeat measurements, where each
row contains a single SSPALS waveform.
For examples see the IPython/ Jupter notebooks,
https://github.com/PositroniumSpectroscopy/sspals/tree/master/examples
**Refs**.
1. D. B. Cassidy et al. (2006), Appl. Phys. Lett., 88, 194105. http://dx.doi.org/10.1063/1.2203336
python tools for analysing single-shot positron annihilation lifetime spectra
## Prerequisites
Tested using Anaconda (Continuum Analytics) with Python 2.7 and 3.5.
Package dependencies:
* scipy
## Installation
via pip (recommended):
```
pip install sspals
```
alternatively, try the development version
```
git clone https://github.com/PositroniumSpectroscopy/sspals
```
and then run
```
python setup.py install
```
## About
Single-shot positron annihilation lifetime spectroscopy (SSPALS) [Ref. 1]
essentially consists of studying the number of annihilation gamma-rays
measured as a function of time following implantation of a time-focused
(~5 ns) positron bunch into a solid target material.
For certain materials a significant fraction of the positrons (~ 30%) will
bind to electrons to form positronium (Ps), which can then be re-emitted
to vacuum. Ps has a characteristic mean lifetime of 142 ns in vacuum, which
makes it relatively easy to identify in SSPALS spectra.
This package includes a handful of useful tools for working with SSPALS data.
The two main functions are used to: (i) combine data split across hi/ low
gain channels of a digital oscilloscope, and (ii) to estimate the amount of
Ps formed using the so-called delayed fraction.
*sspals.chmx(hi, low)*
> Remove zero offset from hi and low gain data, invert and splice
together by swapping saturated values from the hi-gain channel
for those from the low-gain channel. Apply along rows of a 2D array.
*sspals.sspals(arr, dt, limits=[A, B, C])*
> Calculate the trigger time t0 (using a cfd) and the delayed fraction (DF)
(integral B->C / integral A->C) for each row of a 2D array. Return a pandas
DataFrame [(t0, AC, BC, DF)].
Raw data (hi, low) is expected to be 2D arrays of repeat measurements, where each
row contains a single SSPALS waveform.
For examples see the IPython/ Jupter notebooks,
https://github.com/PositroniumSpectroscopy/sspals/tree/master/examples
**Refs**.
1. D. B. Cassidy et al. (2006), Appl. Phys. Lett., 88, 194105. http://dx.doi.org/10.1063/1.2203336
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