The Museum of HP Calculators

hkl (Miller indices) for the HP 48G

This program is by Ed Look and is used here by permission.

This program is supplied without representation or warranty of any kind. Ed Look and The Museum of HP Calculators therefore assume no responsibility and shall have no liability, consequential or otherwise, of any kind arising from the use of this program material or any part thereof.

Overview

calculates Miller indices of planes x-ray reflection from a cubic unit cell from input of 2-theta values from powder pattern and lattice parameter...

... NOTES: "q" is really the Greek letter 'theta', but it cannot be reproduced on the program submission page but exists in the HP-48, and "?" is really the square root symbol, and the same applies.

Listing

<<
"Enter 2q values:"
PROMPT DEPTH →LIST
SORT REVLIST OBJ→ 0
“Enter lattice parameter a:”
PROMPT → dep c a
    <<
           DO ‘c’ INCR
DROP 2 a * SQ SWAP
2 / SIN SQ * 1.54
SQ / DUP FP
            IF .5 <
           THEN IP
           ELSE IP 1 +
           END DUP 3 0 →
dep d
           <<
                DO ‘d’ INCR
DROP DUP ? IP DUP
SQ ROT SWAP 
                  UNTIL ‘dep’
‘d’ ==
                  END DROP 3
→LIST
             >> DEPTH ROLLD
DEPTH ROLLD
          UNTIL ‘dep’ ‘c’
==
          END
     >>
>>

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