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Run Monte-Carlo Simulation for LM-OSL (delocalized transitions)

Source: R/run_MC_LM_OSL_DELOC.R
run_MC_LM_OSL_DELOC.Rd

Runs a Monte-Carlo (MC) simulation of linearly modulated optically stimulated luminescence (LM-OSL) using the one trap one recombination centre (OTOR) model. Delocalised refers to involvement of the conduction band.

Usage

run_MC_LM_OSL_DELOC(
  A,
  times,
  clusters = 10,
  N_e = 200,
  n_filled = N_e,
  R,
  method = "par",
  output = "signal",
  ...
)

Arguments

A

numeric (required): The optical excitation rate from trap to conduction band (s^-1)

times

numeric (required): The sequence of time steps within the simulation (s)

clusters

numeric (with default): The number of created clusters for the MC runs. The input can be the output of create_ClusterSystem. In that case n_filled indicate absolute numbers of a system.

N_e

integer (with default): The total number of electron traps available (dimensionless). Can be a vector of length(clusters), shorter values are recycled.

n_filled

integer (with default): The number of filled electron traps at the beginning of the simulation (dimensionless). Can be a vector of length(clusters), shorter values are recycled.

R

numeric (required): The retrapping ratio for delocalized transitions

method

character (with default): Sequential 'seq' or parallel 'par'processing. In the parallel mode the function tries to run the simulation on multiple CPU cores (if available) with a positive effect on the computation time.

output

character (with default): output is either the 'signal' (the default) or 'remaining_e' (the remaining charges/electrons in the trap)

...

further arguments, such as cores to control the number of used CPU cores or verbose to silence the terminal

Value

This function returns an object of class RLumCarlo_Model_Output which is a list consisting of an array with dimension length(times) x clusters and a numeric time vector.

Details

The model

$$ I_{DELOC}(t) = -dn/dt = A * t/P * (n^2 / (N*R + n(1-R))) $$

Where in the function:
t := time (s)
A := the optical excitation rate from trap to conduction band (1/s)
n := n_filled, the instantaneous number of electrons
R := the retrapping ratio for delocalized transitions
N := N_e, the total number of electron traps available (dimensionless)
P := total stimulation time (s)

Function version

0.1.0

How to cite

Kreutzer, S., 2025. run_MC_LM_OSL_DELOC(): Run Monte-Carlo Simulation for LM-OSL (delocalized transitions). Function version 0.1.0. In: Friedrich, J., Kreutzer, S., Pagonis, V., Schmidt, C., 2025. RLumCarlo: Monte-Carlo Methods for Simulating Luminescence Phenomena. R package version 0.1.10. https://r-lum.github.io/RLumCarlo/

References

Pagonis, V., Friedrich, J., Discher, M., Müller-Kirschbaum, A., Schlosser, V., Kreutzer, S., Chen, R. and Schmidt, C., 2019. Excited state luminescence signals from a random distribution of defects: A new Monte Carlo simulation approach for feldspar. Journal of Luminescence 207, 266–272. doi:10.1016/j.jlumin.2018.11.024

Further reading

Chen, R., McKeever, S.W.S., 1997. Theory of Thermoluminescence and Related Phenomena. WORLD SCIENTIFIC. doi:10.1142/2781

Author

Sebastian Kreutzer, Institute of Geography, Heidelberg University (Germany)

Examples

run_MC_LM_OSL_DELOC(
 A = 0.12,
 R = 0.1,
 times = 0:50,
 method = "seq",
 clusters = 10) %>%
plot_RLumCarlo(legend = TRUE)