An Air Force captain from Centreville who thought he was exchanging sex-related e-mail with a 14-year-old girl in Colorado was writing to a 53-year-old male sheriff's deputy, who arrested him last month when he tried to meet the "girl" at a Pueblo, Colo., motel room, authorities said.

Documents released yesterday in Fairfax County Circuit Court indicated that Peter Tims, 38, of the 14600 block of Flower Hill Drive, apparently was snared by the Colorado Internet Crimes Against Children Task Force. The Pueblo County Sheriff's Office was one of two Colorado agencies to receive a federal grant to fight Internet crimes, Pueblo spokesman Dave Pettinari said, and it sends Detective Robert Miller into Internet chat rooms posing as a teenage girl. "It's a feeding frenzy," Pettinari said.

Miller told Tims that his name was "Lorie," that she lived in Pueblo, and that she was interested in learning about sex, according to court documents. According to Miller's affidavit, the two exchanged e-mail over three weeks before Tims arranged to meet Lorie at a Pueblo motel. He was arrested there July 7, charged with one felony count of enticement of a child and released on $25,000 personal recognizance bond.

Pueblo authorities said Tims worked as an acquisition manager for the National Reconnaissance Office, which develops and operates the nation's intelligence satellites. Neither he nor Air Force officials could be reached for comment yesterday.