Kilian Wolfgang1, Frank Seifert1, Silvia Knappe-Grüneberg1, Jens Voigt1, Eva Al-Dabbagh1, and Isaac Fan1
Two distinct methods for precise flip angle determination for hyperpolarized
rare gas samples are presented and were performed in ultra low magnetic field
environment ($$$\approx\,\mu$$$T). The repetitive coherent excitation method is
rather fast and allows for preserving most of the initial polarization whereas
the incoherent excitation method is time consuming but determines the relaxation
parameters $$$T_1$$$ and $$$T_2^\star$$$ inherently.