Where the 1962 Missal is used, the Asperges is done before the principal Mass on Sunday, except on Palm Sunday, when it is replaced with the blessing of palms followed by a procession [REF].
Both the Asperges and the Vidi aquam are structured like the Introit of the Tridentine Mass: 1st verse (which includes Alleluias in Eastertide), 2nd verse (always from the Psalms), Gloria Patri (omitted in Passiontide), and then the 1st verse again.