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We present high-resolution crystal spectroscopy measurements of the $n=3\ensuremath{\rightarrow}n=2$ $L$-shell x-ray transitions of neonlike W${}^{64+}$, which include seven electric-dipole\char21{}allowed transitions, two electric quadrupole transitions, and one magnetic quadrupole transition. The resulting wavelength data are compared to recent calculational results, allowing us to clearly distinguish between different theoretical approaches which need to take into account not only substantial electron correlations effects but also radiative contributions, which in case of the transition from the upper level ${(1{s}^{2}2{s}_{1/2}2{p}^{6}3{p}_{3/2})}_{J=1}$ to the closed-shell neonlike ground state exceeds 20 eV. Best agreement is found with calculations utilizing the relativistic multireference M\o{}ller-Plesset approach. In addition to the emission from W${}^{64+}$, we observed several inner-shell collisional satellite lines associated with oxygenlike W${}^{66+}$, fluorinelike W${}^{65+}$, sodiumlike W${}^{63+}$, and magnesiumlike W${}^{62+}$, which provide benchmarks for future calculations as well as for recent calculations using the relativistic many-body perturbation theory. The present measurements also provide accurate rest wavelengths for establishing the instrumental dispersion needed for future measurements of the core plasma motion in the ITER tokamak and show that the candidate W${}^{64+}$ line for such measurements remains well isolated from neighboring collisional satellite lines even when broadened by the expected high temperatures in this device.

L-shell x-ray emission from neonlike W64+