Harrison E. Radford, a molecular spectroscopist who conducted research at the Harvard-Smithsonian Center for Astrophysics (formerly the Harvard College Observatory) from 1969 until his retirement in 1992, died on May 5, 2000, after a long struggle with ALS (Lou Gehrig’s Disease). A memorial service for Radford will be held on Saturday, May 13, at 11 a.m. at the First Church in Belmont, 404 Concord Ave., Belmont.