) Sin600, where mc is the electron mass and Mp < /sub> is the projectile mass] known as the Thomas peak. A mixture of analytical and numerical methods have been used to calculate the transition amplitudes for state to state [H+ +H(nIm)→H (n´I´m´) + H+] reaction and therefore the corresponding cross sections. Many numerical and analytical calculations are available within a near-the-shell limit for 1s-1s transition of electron-capture process in proton hydrogen collision, but no calculation was performed for the state (nlm) to state (n’l’m’). We have compared the calculated differential cross sections for electron capture of different states and also with the available measured cross sections in the literature.]]>