The spectral eigenvalues of a class of product-form self-similar spectral measure

Let μ_{M,D} be the self-similar measure generated by the positive integer M=RN^q and the product-form digit set D={0,1,\dots,N-1}\oplus N^{p_1}{0,1,\dots,N-1}\oplus \cdots \oplus N^{p_s}{0,1,\dots,N-1}, where R>1, N>1, q, p_i(1\leq i\leq s) are positive integers with gcd(R,N)=1 and p_1<p_2<\cdots<p_s<q. In this paper, we first show that μ_{M,D} is a spectral measure with a model spectrum Λ. Then we completely settle two types of spectral eigenvalue problems for μ_{M,D}. On the first case, for a real t, we give a necessary and sufficient condition under which tΛis also a spectrum of μ_{M,D}. On the second case, we characterize all possible real numbers t such that there exists a countable set Λ’\subset $\mathbb{R}$ such that Λ’ and tΛ’ are both spectra of μ_{M,D}.