WASHINGTON – A Maryland scientist who worked for the Defense Department, a White House space council and other agencies was arrested Monday on charges of passing along classified information to an undercover FBI agent he believed was an Israeli intelligence officer.

Stewart David Nozette, 52, of Chevy Chase, was charged in a criminal complaint with attempting to communicate, deliver and transmit classified information, the Justice Department said. The complaint does not allege that the government of Israel or anyone acting on its behalf violated U.S. law.

Nozette was arrested by FBI agents. He is expected to make his initial appearance in federal court in Washington on Tuesday.

In an affidavit supporting the complaint, FBI agent Leslie Martell said that on Sept. 3, Nozette received a telephone call from an individual purporting to be an Israeli intelligence officer. The caller was an undercover FBI agent.

Nozette agreed to meet with the agent later that day at a hotel in Washington and in the subsequent meeting the two discussed Nozette's willingness to work for Israeli intelligence, the affidavit said.

Nozette allegedly informed the agent that he had, in the past, held top security clearances and had access to U.S. satellite information, the affidavit said.

Nozette also allegedly said that he would be willing to answer questions about this information in exchange for money. The agent explained that the Israeli intelligence agency, Mossad, would arrange for a communication system so Nozette could pass on information in a post office box.

Nozette agreed to provide regular, continuing information and asked for an Israeli passport, the affidavit alleged. It gave this sequence of events:

_Sept. 4. Nozette and the agent met again in the same hotel. The scientist allegedly said that while he no longer had legal access to any classified information at a U.S. government facility, he could, nonetheless, recall classified information by memory. Nozette allegedly asked when he could expect to receive his first payment, saying he preferred cash amounts "under ten thousand" so he didn't have to report it.

Nozette allegedly told the agent, "Well, I should tell you my first need is that they should figure out how to pay me ... they don't expect me to do this for free."

_Sept. 10. Undercover FBI agents left a letter in the designated post office box, asking Nozette to answer a list of questions about U.S. satellite information. The agents provided a $2,000 cash payment. Serial numbers of the bills were recorded.

_Sept. 16. Nozette was captured on videotape leaving a manila envelope in the post office box. The next day, agents retrieved the sealed envelope and found, among other things, a one-page document containing answers to the questions and an encrypted computer thumb drive.

One answer contained information classified as secret, which concerned capabilities of a prototype overhead collection system. Nozette allegedly offered to reveal additional classified information that directly concerned nuclear weaponry, military spacecraft or satellites, and other major weapons systems.

_Sept. 17. Agents left a second letter in the post office box with another list of questions about U.S. satellite information. The FBI also left a cash payment of $9,000. Nozette allegedly retrieved the questions and the money the same day.

_Oct. 1. Nozette was videotaped leaving a manila envelope in the post office box. FBI agents retrieved it and found a second set of answers. The responses contained information classified as both top secret and secret, on U.S. satellites, early warning systems, means of defense or retaliation against large-scale attack, communications intelligence information, and major elements of defense strategy.

Nozette had worked in varying jobs for the Energy Department, NASA and the National Space Council in the president's office in 1989 and 1990.

He developed the Clementine bi-static radar experiment that purportedly discovered water on the south pole of the moon. He worked at the Energy Department's Lawrence Livermore National Laboratory from approximately 1990 to 1999, where he designed highly advanced technology.

At the Energy Department, Nozette held a special security clearance equivalent to the Defense Department top secret and "critical nuclear weapon design information" clearances. DOE clearances apply to access to information specifically relating to atomic or nuclear-related materials.

Nozette also held top offices at the Alliance for Competitive Technology, a nonprofit corporation that he organized in March 1990. Between January 2000 and February 2006, Nozette, through his company, had several agreements to develop advanced technology for the U.S. government.

He performed some of this research and development at the U.S. Naval Research Laboratory in Washington, the Defense Advanced Research Projects Agency in Arlington, Va., and the National Aeronautics and Space Administration Goddard Space Flight Center in Greenbelt, Md.