When a Ne:BCl3 sample is codeposited at approximately 5 K with a beam of neon atoms that have been excited in a microwave discharge, the infrared spectrum of the resulting solid deposit shows a weak to moderately intense absorption of BCl2 and more prominent absorptions which are assigned to the v(3) fundamentals of BCl3+ (D-3h) and of linear, centrosymmetric BCl2+. The boron- and chlorine-isotopic structure of the spectrum is consistent with both of these assignments. Ab initio calculations support the BCl2+ assignment. An absorption is also tentatively assigned to nu(3)(e) of BCl3-. Ab initio calculations for BCl3- are consistent with that assignment. The processes which occur when the solid deposit is exposed to visible and ultraviolet radiation are considered.