Laser spectroscopy of antiprotonic helium atomcules. Collisional shift and broadening of resonance lines

Metastable antiprotonic helium atomcules were observed by laser spectroscopy. The results showed the resonance lines such as 597.259 and 470.724 nm caused by (n,l)=(39,35)→(38,34) and (37,34)→(36,33), respectively. Two values were modified to 597.2570±0.0003 nm and 470.7220±0.0006 nm in vacuum by determining under conditions of narrowing the band width of dye laser until 1 GHz and various densities and by calibrating the wave length by the standard absorption line of iodine and tellurium molecule. These values agrees closely with the theoretical values within 2 to 3 ppm reported by three groups. (S.Y.)