1. Department of Physics, Graduate School of Science Osaka University Osaka 560‐0043 Japan
2. Hamamatsu Photonics K.K. Iwata 438‐0193 Japan
3. MS‐Cheminformatics LLC Toin 511‐0231 Japan
4. Project Research Center for Fundamental Sciences, Graduate School of Science Osaka University Osaka 560‐0043 Japan