 , rotating-crystal photograph of 96
Absorption (of x-rays) 176—182 472
Absorption coefficient, linear 181
Absorption coefficient, mass 181
Absorption error 413—417 424 427—429
Absorption error for divergent radiation 404—409
Absorption error for parallel radiation 402—404
Absorption theory 178—179
Adjusting the crystal in the rotating—crystal method 182—185 186
Amplitudes of scattered waves 53
Angles of reflection 49
Angstroem units 29
Angular constants, of direct cell 375—385
Angular constants, of reciprocal cell 372—374
Anti-equi-inclination case 301
Anti-equi-inclination case of the de Jong and Bouman method 333 343—344
Assignment of indices 98 100—106
Atom, structure of 29
Atomic number 29
Atomic scattering factor f 53
Available orders 292
Axes, of rotation 47 473
Axes, reciprocal lattice, measuring lengths of 280—283
Axes, reciprocal lattice, measuring lengths of, selection of 280—283
Axes, screw 47 60 80 81 89
Axes, transformation of 10—28
Axial angles, relations of, in direct and reciprocal cell 352—356
Axial glide 74—76
Axial glide, extinctions due to 75 76
Axial label, choice of 365—369
Axial ratio of reciprocal parallelogram lattice 116
Axial ratio of reciprocal rectangular lattice 114
Axial ratio, determination of 106
Axial row spacing, determination of 387
Axial transformation 10—28
Axial transformation, example of 20—22 28
Axis of rotation of de Jong and Bouman film 336 337
Azimuth, angle upsilon (T) 137
Back-reflection chart 441
Bernal 104 198
Bernal chart 144—150 154 232 304 315 496
Berthierite, oscillating-crystal photographs of 200 203 204
Blank reciprocal lattice 196
Body-centered lattice 66 67 75
Body-centered lattice, extinctions due to 67 90
Body-centered lattice, reciprocal of 492
Bouman 331—340
Bradley and Jay 397 404
Bradley and Jay's extrapolation 409 411—426 452
Braekken 396 420
Bragg 1
Bragg focusing 399
Bragg's law 43—47
Bragg's law, geometrical interpretation of 128—132
Bravais 107
Calibration of film for elimination of error 411 412
Camera, de Jong and Bouman 331—340
Camera, rotating-crystal 167—171
Camera, Sauter 218 312—321
Camera, Schiebold 312 313 321—330
Camera, shielding of 292
Camera, symmetrical back-reflection Weissenberg 436—441
Camera, Weissenberg 218 221 222 252 253 284—295
Carriage, camera 292 293
Cell area, multiplication of 26
Cell edges and angles 119 357
Cell volume 347—352
Cell volume, changes with transformation 25—28
Cell volume, multiplication of 27
Cell, centered 62
Cell, choice of 364 365
Cell, doubly primitive etc. 5 6 28 61 62
Cell, interpretation of 495—504
Cell, large, indexing reflections from 198
Cell, non-primitive 62 364
Cell, orientation of 369
Cell, primitive 5 6 28 61 62 364
Cell, primitive, volume of 123 124
Cell, reduced 364
Cell, reduced, selection of 365
Cell, unit 2 5 6
Cell, unit, determination of dimensions 155—157 492—495
Centered cell 62
Centered lattice 63
Centered lattice, extinction rule for 64
Centered pattern 64
Centered plane pattern 76
Central reciprocal lattice line, reflections from 255—261
Central reciprocal lattice line, shape of, on flat-cone Sauter photographs 316
Central reciprocal lattice line, shape of, on flat-cone Weissenberg photographs 304
Central reciprocal lattice line, shape of, on general-inclination Weissenberg photographs 310
Central reciprocal lattice line, shape of, on normal-beam Weissenberg photographs 242
Centrosymmetrical pair of atoms 54
Centrosymmetrical space point-group 473 489
Centrosymmetrical symmetry classes 58
Changing of target 460
Characteristic radiation 151 176
Chi ( ), inclination angle 137
Chief zone 367
Choice, of axial label 365
Choice, of cell 364 365
Choice, of radiation 171 174—178
Claudetite, second level de Jong and Bouman photograph of 335
Claudetite, zero level de Jong and Bouman photograph of 335
Cohen 397
Cohen's analytical extrapolation 426—432 452 454 455
Collimator design 166—167 285 287 288 397—399 438 439
Compaction and extension of spots on n layer Weissenberg photographs 227—229
Component, reflection 73
Compounding of waves diffracted by lattice arrays 51—55
Concentricity and parallelism adjustments 292
Conditions for diffraction by a row of atoms 31—34
Convergent radiation 193
Coordinate system, change of 12
Coordinate system, lattice grid 6
Correction factors, intensity 55
Cosines, direction 36 41 42
Coupling constants 224
Crystal pattern 47 54
Crystal size, choice of 178—182
Crystal size, optimum 179—182
Crystal structure 1
Crystal, adjustment of, in Weissenberg method 287 288
Crystal, mechanism for oscillating 188—193
Crystal, mechanism for rotating 285—287 288—291
Crystal, orientation of 288 289
Cyclical groups 467—473
Cylindrical coordinates 135—137 139
Cylindrical coordinates, determination of, from rotating-crystal method 144—150
Cylindrical coordinates, determination of, from Weissenberg method 233—249
Cylindrical coordinates, relation of, to reflection coordinates 233—241
Cylindrical film recording 93 97
de Jong and Bouman camera 331—340
de Jong and Bouman camera, film rotation axis of 336 337
de Jong and Bouman method 331—346
de Jong and Bouman photographs, anti-equi-inclination method 333 343 344
de Jong and Bouman photographs, determining lattice constants from 364 369 371 372 375 376 387 391
de Jong and Bouman photographs, equal-cone method 344—345
de Jong and Bouman photographs, equi-inclination method 333 341—343
de Jong and Bouman photographs, examples of 334 335
de Jong and Bouman photographs, interpretation of 466 494 496 499
de Jong and Bouman photographs, normal-beam method 341
de Jong and Bouman principle 210
Degenerate identity period 74
Dehlinger 396
Determinant of transformation 27
Deviation angles, measurement of 400
Diagonal glide 74—77
Diagonal glide, extinctions due to 76 77
Diamond glide 75 79—80
| Diamond glide, extinctions due to 79 80
Diamond net 61 478 479 489
Diamond net, reciprocal of 491
Diamond plane lattice 61
Diamond structure 75
Diamond, rotating-crystal photograph of 153
Diffracted radiation, direction of 36 41
Diffraction identity period 74
Diffraction intensity computations 55
Diffraction maxima 35 37 38
Diffraction spots, loci of 94
Diffraction symbols 510
Diffraction symmetry 56—58
Diffraction wave, nth order 30 33 34
Diffraction, by a plane lattice array of atoms 34—38
Diffraction, by a row of atoms 31—34
Diffraction, by a three-dimensional array of atoms 39—43 49
Diffraction, of a wavefront 30
Diffraction, of x-rays by crystals 29—59
Diffraction, orders of 30 33 34
Dihedron groups 468
Direct beam 30
Direct beam, screen for 226 291
Direct cell constants, angular 375—385
Direct cell constants, determination of 375
Direct cell constants, linear 385—388
Direction cosines 36 41 42
Direction, indices of lattice 7
Direction, of diffracted radiation 36 41
Displacements within planes 74
Divergence of x-ray beam 397—399
Divergent radiation, absorption error for 404—409
Doublets, resolved 399
Doubly primitive cell 5 6 28 61 62
Eccentricity errors 400 401 411 413 415—417 423 427 428 436
Electromagnetic wave 29
Electron vibrations 29
Elements of repetition 2 3
End-centered lattice 65 66
End-centered lattice, extinctions due to 66
End-centered lattice, reciprocal of 492
Envelopes, film 168—171
Envelopes, wave 30
Equal-cone photographs 304—306
Equal-cone photographs, de Jong and Bouman method 344 345
Equation, Laue 41 62
Equation, of reflection angle, for equi-inclination method 284
Equation, of reflection angle, for general-inclination method 284
Equation, of reflection angle, for normal-beam method 284
Equi-inclination photographs 253 254 296 301
Equi-inclination photographs, de Jong and Bouman method 333 341—343
Equi-inclination photographs, Sauter method 321 330
Equi-inclination photographs, Schiebold method 326—330
Equi-inclination photographs, Wiessenberg method 252—295
Equi-inclination photographs, Wiessenberg method, advantages of 283 284
Equi-inclination photographs, Wiessenberg method, characteristics of 254
Equi-inclination photographs, Wiessenberg method, equation for reflection angle 284
Equi-inclination photographs, Wiessenberg method, examples of 256 257 280 281 308 381 501
Equi-inclination photographs, Wiessenberg method, instrument for 252 253 284—295
Equilateral triangular net 478 479
Equilateral triangular net, reciprocal of 491
Error, absorption 413—417 424 427—429
Error, absorption, for divergent radiation 404—409
Error, absorption, for parallel radiation 402—404
Error, elimination of, by careful experimental technique 394—396
Error, elimination of, by comparison 394
Error, elimination of, by graphical extrapolation 396 397
Error, elimination of, by high angle reflection 396
Error, elimination of, by systematic allowance 396
Error, film shrinkage 395 401 402 411 417 419—424 427 428 436
Error, geometrical 399
Error, physical 399
Error, radius 395 401 402 411 417 423
Error, sources of 399—409
Ewald 107
Examining photographs 185—187
Extinction rule 82
Extinction rule, for a centered lattice 64
Extinctions 60 175 495
Extinctions, absence of 82 90
Extinctions, due to axial glide 75 76
Extinctions, due to body-centered lattice 67 90
Extinctions, due to diagonal glide 76 77
Extinctions, due to diamond glide 79 80
Extinctions, due to end-centered lattice 66
Extinctions, due to face-centered lattice 68
Extinctions, due to glide planes 71—80
Extinctions, due to hexagonal centering 71
Extinctions, due to non-primitive lattices 60—65
Extinctions, due to rhombohedral centering 69 70
Extinctions, due to screw axes 80 81 90
Extinctions, in the more general classes of spectra 90
Extinctions, space group 60—90
F (composite amplitude of scattered wave) 53
f (scattering power of an atom) 53
Face-centered lattice 67 68 75
Face-centered lattice, extinctions due to 68
Face-centered lattice, reciprocal of 492
False intensity distribution 470
Fankuchen, I. 197
Film calibration for the elimination of errors 411 412
Film coordinates, transformation to reciprocal lattice coordinates from 142 143
Film coordinates, transformation to, from reciprocal lattice coordinates 139—142
Film envelopes 168—171
Film holder, for de Jong and Bouman camera 33—6 337
Film holder, for rotating-crystal camera 167—171
Film holder, for Sauter camera 218
Film holder, for Schiebold camera 321—325
Film holder, for Weissenberg camera 218 292 440
Film shrinkage 401
Film shrinkage, errors due to 395 401—402 411 417 419—424 427 428 436
Film, cylindrical 93 97
Film, flat 93 97
First layer cone 95
First-order diffraction wave 30 33 34
Flat diffraction-cone photographs 301—304
Flat diffraction-cone photographs, examples of 303 308 324
Flat diffraction-cone photographs, Sauter method 315—321
Flat plate recording 93 96 97
Flat plate recording, examples of 96 107
Fractional orders of diffraction 34
Friedel's law 58
Garrido's method 244 245 253
General-inclination method 296 299 306—311
General-inclination method, equation for reflection angle 284
General-inclination photographs, interpretation of 311
Geometrical errors 399
Geometry of oblique cells and their reciprocals 347—363
Geometry of the repeating scheme 2
Glancing angle, ( ) 45 393
Glancing angle, determination of 98—100
Glide planes 60 71—80 82 89
Glide planes, determining presence of 509 510
Glide planes, effect of 505—510
Glide planes, extinctions due to 71—80
Glide planes, identification of 89
Glide planes, identity period 71—74
Glide planes, kinds of 74 75
Glide, axial 74—76
Glide, diagonal 74—77
Glide, diamond 75 79—80
Glide-reflection, repetition by 2 3
Gnomonic projection 107
Goldschmidt polarform ratio 362 363
Graphical indexing 160
Graphical reconstruction of the reciprocal lattice 231—233
Groups, cyclical 467—473
Groups, dihedron 468
Groups, line 467
Groups, plane 467—473
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