Full use-format
the full use-format contains the current curve and a full description of the experimental parameters. The latter must be written to the file in exactly the same form as on the Property Page: Simulation Parameters:
DigiElch_IMP_Header
experimental parameters:
key_word_1: Value_1
key_word_2: Value_2
.
.
species parameters:
[name of species_1] (M/l): Canal_1
[name of species_2] (M/l): Canal_2
.
.
experimental IMP-data:
number of ZI (Ohm), ZR (Ohm) couples: N
ZR_1 , ZI_1
ZR_2 , ZI_2
.
.
ZR_N , ZI_N
Signal Header
f_1 , Phi_1 , A_1
f_2 , Phi_2 , A_2
.
.
f_15 , Phi_15 , A_15
•DigiElch_IMP_Header
source program: DigiElch for Windows
program version: 3.0
file type: IMP •key_word_i and Value_i
key word and value referring to the i-th parameter. The value must be in point-format and separated from the key word by a colon. The key words are the same as the parameter names used on the Property Page: Simulation Parameters. For example,
Pre-Equilibrium: smart
Diffusion: Semi-Infinite 1D
Geometry: Planar
Area (cm²): 1
Ru (Ohm): 0
Cdl (F): 0
Temp. (K): 298.2
dEac (V): 0.015
AC-Packets: 2
fmin (Hz): 100
fmax (Hz): 5050
log2(Data Points): 11
Applied Frequencies: 15
Estart (V):0.3
Edc (V):0
DC-Time (s):5 •name of species_i and Canal_i
the name of the i-th species in brackets and the analytical concentration in point-format. For example
[NiL] (M/l): 0.001
[NiL-] (M/l): 0
[DP] (M/l): 0.1
[NiLDP] (M/l): 0
[NiLDP-] (M/l): 0 •N
the number of Applied Frequencies. •ZR_i and ZI_i
numbers (separated by comma) representing the real imaginary part of the impedance simulated for the i -th frequency component •Signal Header
an abbreviation for the following line: signal components (f/fo, phase angle, rel. amplitude):
This line is followed by a description of the applied AC-Signal (which should always be defined for 15 frequency components even if the data refer to a smaller number of actually Applied Frequencies): of_i
(relative) value of the i-th frequency component oPhi_i
absolute value of the phase angle of the i-th frequency component oA_i
relative value of the amplitude of the i-th frequency component
All relative values refer to the corresponding value of the basic frequency. It is the frequency which would be obtained if the signal formed by the 2n data points (where n is the number defined in log2(Data Points)) covers exactly a single sinus cycle.
Minimum use-format
Data measured with third-party electrochemical instruments are usually exported in file formats which differ from instrument to instrument. The minimum use-format enables the user to produce an importable use-file with a minimum of effort.
The minimum use-format is as follows:
DigiElch_IMP_Header
experimental IMP-data:
number of ZI (Ohm), ZR (Ohm) couples: N
ZR_1 , ZI_1
ZR_2 , ZI_2
.
.
ZR_N , ZI_N
•ZR_i and ZI_i
numbers (separated by comma) representing the real imaginary part of the impedance simulated for the i -th frequency component  Files in minimum use-format do not contain any information about experimental parameters such as scan rate, electrode surface, electrode geometry or species concentrations. It is therefore not possible for the fitting procedure to recognize to which parameter combination a particular experimental curve refers. Consequently, such files are useful only for viewing experimental current curves. Apply the Edit/Modify command to add the experimental parameters to each file.
|
