Regioselectivity, chemical bonding and physical nature of the interaction between imidazole and XAHs (X= H, F, Cl, Br, CH3, and A= S, Se, Te).pdf of Regioselectivity, chemical bonding and physical nature of the interaction between imidazole and XAHs (X= H, F, Cl, Br, CH3, and A= S, Se, Te)