A sample probe and apparatus are provided for magnetic resonance
experiments. The probe includes a coil simultaneously tunable to at least
two different frequencies. The coil includes a section having a scroll
configuration and defines a core into which a sample can be inserted. A
multi-resonant circuit transmits RF energy to the coil at two or more
different frequencies for exciting nuclei of the sample. The apparatus
includes a coil having a scroll configuration. RF transmission circuitry
transmits RF energy to the coil at two or more different frequencies. RF
receiving circuitry receives an RF signal responsive to excitation. A
coil is magnetically coupled with a sample at an RF frequency.