Ring-polymer instanton Calculations 
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rates_1D_double_well: vanilla instanton rate calculation  for 1D double well
rates_2D_muller_brown: vanilla instanton rate calculation for 2D muller brown potential
rates_multiD_CH4_H: instanton rate calculation for multiD CH4+H reaction (Inside this example, many non-vanilla optimization are presented)

tunneling_splitting_water_trimer : Ring-polymer Instanton tunneling splitting calculation for a water trimer
