Quantum yields in the 58.4-nm photolyses of ammonia and water

Need a single-mode red laser, cheap? Check your pockets!

“…1 shows I 2 absorption spectra recorded on a UV-visible spectrophotometer ͑Shimadzu UV2101PC͒, using as light source an inexpensive key-chain-type red laser pointer ͑Ͻ$5, from China, but no stated manufacturer͒. 2,3 The tuning was achieved by allowing the laser to run for several minutes, then turning it off, and back on. The spectral resolution exceeds that in the comparison spectrum, which was obtained with a very high quality Fourier transform instrument.…”