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- W3036003104 abstract "Reported efforts to obtain molecular images have hitherto been confined to chlorinated copper phthalocyanine that is atypical in having a high thermal and radiation stability. The radiation limited resolution of molecules has been described by the minimum resolvable object size C being object contrast f electron utilisation factor N cr critical exposure for specimen destruction The normal value used for C is approximately 0.1 but since this is the parameter most ameanable to improvement, efforts to increase C were made These efforts included the use of a high resolution objective lens of Cs = 0.67mm so that the constant phase contrast transfer envelope extended down to 3Å at the Scherzer defocus, and a 20μm condenser aperture Minimal exposure techniques were used with Ilford X-ray film to overcome the difficulties of low beam intensity and mechanical vibration of the specimen. Our previous studies on α' copper phthalocyanine(2) had required the specimen to be tilted for molecular superimposition on the unit cell b axis, A survey of a variety of hydrocarbons revealed that structures of planar molecules where the molecular plane makes an angle of greater than 40° to the b axis, tend to grow on KC1 with the b axis normal to substrate - i,e. no tilting is required to image a column of superimposed molecules." @default.
- W3036003104 created "2020-06-25" @default.
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- W3036003104 date "1978-01-01" @default.
- W3036003104 modified "2023-09-26" @default.
- W3036003104 title "Molecular images of phthalocyanines and hydrocarbons" @default.
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- W3036003104 doi "https://doi.org/10.1017/s0424820100108428" @default.
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