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Coherent state path integrals are shown in general to contain instantons withjumps at the boundaries, i.e., with boundary points lying outside classicalparameter or phase space. As an example, the magnetic molecule Fe_8 is studiedusing a realistic Hamiltonian, and instanons with jumps are shown to dominatebeyond a certain external magnetic field. An approximate formula is found forthe fields where ground state tunneling is quenched in this molecule.Comment: 4 pages, revtex4 format, 3 embedded eps figure

SU(2) Instantons with Boundary Jumps and Spin Tunneling in Magnetic Molecules