an extracting efficiency of electrons obtained from the specimen. In the SEM according to the retarding method, a positive electric voltage is applied to a liner tube in an electrooptic system so as to feed high energy to an electron beam passing through a lens position, and, by generating a decelerating electric field between the liner tube and specimen, the electron beam is decelerated immediately before the electron beam attains to the specimen.
Japanese Patent Laid-open No. 9-171791 discloses that, by locating an accelerating cylinder at an extended line of a passage through which an electron beam passes in an objective lens, an accelerating voltage is applied so as to accelerate the electron beam, and, by applying a superimposing voltage to a specimen, a decelerating electric field to theDavid Petraeus, a retired four-star general and former director of the CIA, pleaded guilty Tuesday to giving highly classified information to his ex-mistress. The information came in the form of eight black books that contained everything from identities of covert officers to discussions with President Obama.

The Justice Department and Federal Bureau of Investigation alleged back in 2012 that Petraeus gave secret information to Paula Broadwell, but the seriousness of the information wasn’t clear until now.

While he was commander of coalition forces in Afghanistan, Petraeus “maintained bound, five-by-eight inch notebooks that contained his daily schedule and classified and unclassified notes he took during official meetings, conferences and briefings,” the U.S. Attorney’s Office for the Western District of North Carolina writes in a statement of fact regarding the case.

The notebooks