Limitations
- The general limitation of PEEM, which is common with most surface science methods, is that the PEEM operates only under fairly restricted vacuum conditions. Whenever electrons are used to excite a specimen or carry information from its surface there has to be a vacuum with an appropriate mean free path for the electrons.
- The resolution of PEEM is limited to about 10 nm, which results from a spread of the photoelectron emission angle. Angle resolved photoemission spectroscopy (ARPES) is a powerful tool for structure analysis. However, it may be difficult to make angle-resolved and energy-selective PEEM measurements because of a lack of intensity. The availability of synchrotron-radiation light sources can offer exciting possibilities in this regard.
Read more about this topic: Photoemission Electron Microscopy
Famous quotes containing the word limitations:
“Growing up means letting go of the dearest megalomaniacal dreams of our childhood. Growing up means knowing they can’t be fulfilled. Growing up means gaining the wisdom and skills to get what we want within the limitations imposed by reality—a reality which consists of diminished powers, restricted freedoms and, with the people we love, imperfect connections.”
—Judith Viorst (20th century)
“That all may be so, but when I begin to exercise that power I am not conscious of the power, but only of the limitations imposed on me.”
—William Howard Taft (1857–1930)
“The limitations of pleasure cannot be overcome by more pleasure.”
—Mason Cooley (b. 1927)