(ii) Calculate the difference in arrival time at the detector for two singly charged ions in a time of flight mass analyzer, one with m/z 1252.054 and another with m/z 1253. 138 accelerated by a potential of 20kv in a 1.750m flight tube. {IV = 1, IJ = 1kg ICIAS, e = 1.602 x C IU = 1 amu = 1.6605 x kg IT = 1 kg = 1 kg } Give your answer in nanosecond. [4 marks]