The Yolo County District Attorney's office does not say in the five-page complaint whether 32-year-old David Snyder intended to harm anyone with the items found in his apartment.
Snyder pleaded not guilty during a brief initial court appearance Thursday in Yolo County Superior Court in Woodland, north of Sacramento. One of his defense attorneys, Linda Parisi, said her client had the materials for research.
"What happened in Dr. Snyder's apartment was an accident. He harbored no intent to build or detonate an explosive device," she said. "He is a chemist working on a variety of projects."
Assistant Chief Deputy District Attorney Michael Cabral said investigators found liquid and solid explosive materials and devices to detonate them in the apartment. He said Snyder had assistance from another individual who is connected to the university but is not a faculty member. That individual has been questioned by investigators, Cabral said, but has not been charged.
Snyder has a doctorate in chemistry from the university.