The appearance of ........ positions was slightly shifted to higher wavelength (lower photon energy) when concentration were varied. Then the results of concentration effect were analyzed using พีคฟิด
, the appearance of .... positions was slightly shifted from 601.51 to 604.12, 607.64, and 618.44 nm at the concentration of 50, 60, 70 and 80 % by volume, respectively.