Simplified Calculation of Phase Contrast for Finite Detector and Illumination Angles
1974 ◽
Vol 32
◽
pp. 370-371
Keyword(s):
Modern microscopes are capable of resolutions of the order of 2 Å. To fully utilize this capability, the experimentalist must turn to reliable calculations of contrast to optimize the various parameters available.However, until recently (e.g. Ref. 1), most calculations of phase contrast were performed using restricted conditions such as parallel illumination in the CTEM and a point detector in the STEM, because exact calculations using general geometries became rather involved. This can be seen from Eq. (1) for phase contrast in the general case of finite illumination angle, αO, as a function of distance from and finite detector angle βO.
1978 ◽
Vol 36
(2)
◽
pp. 170-171
1978 ◽
Vol 36
(2)
◽
pp. 106-107
1978 ◽
Vol 36
(3)
◽
pp. 207-217
Keyword(s):
1974 ◽
Vol 32
◽
pp. 390-391
Keyword(s):
1982 ◽
Vol 40
◽
pp. 50-51
Keyword(s):
1978 ◽
Vol 36
(1)
◽
pp. 484-485
Keyword(s):
1972 ◽
Vol 30
◽
pp. 618-619
Keyword(s):
1991 ◽
Vol 49
◽
pp. 552-553
Keyword(s):
1978 ◽
Vol 36
(1)
◽
pp. 176-177
Keyword(s):