Dr. Probe - control file aberration indexing

Dr. Probe / documentation / msa / control file
Dr. Probe / documentation / wavimg / control file

 

The control files of the programs MSA and WAVIMG contain options to define the probe and imaging aberration states, respectively. The programs support aberration coefficients up to the 8th order. Descriptions are given here of how to define aberrations in these files.

Aberration definitions in the parameter control files are an index number followed by two coefficient values.

Examples:

The index number (0 ... 23) identifies the aberration type and the two values are the x and y components of the respective aberration coefficient in nanometer units. A complete aberration list is given below including typical coefficient notations.

 

index

aberration coefficient

0

Image shift (a11, C0,1, A0)

1

Defocus (a20, C1,0, C1)

2

Twofold astigmatism (a22, C1,2, A1)

3

Coma (a31, C2,1, 3·B2)

4

Threefold astigmatism (a33, C2,3, A2)

5

Spherical aberration (a40, C3,0, C3)

6

Star aberration (a42, C3,2, 4·S3)

7

Fourfold astigmatism (a44, C3,4, A3)

8

Coma (5th order) (a51, C4,1, 5·B4)

9

Three-lobe aberration (a53, C4,3, 5·D4)

10

Fivefold astigmatism (a55, C4,5, A4)

11

Spherical aberration (6th order) (a60, C5,0, C5)

12

Star aberration (6th order) (a62, C5,2, 6·S5)

13

Rosette aberration (a64, C5,4, 6·R5)

14

Sixfold astigmatism (a66, C5,6, A5)

...

  (further in the power-law series)  

23

Eightfold astigmatism (a88, C7,8, A7)

 

Last update: Jan 30, 2019    contact    disclaimer(de)