The microwave absorption spectrum of the trans-ethyl methyl ether in the skeletal torsional v₃₀ = 2 state was analyzed for the first time. The trans-ethyl methyl ether molecule has two inequivalent methyl group internal rotors. Splitting due to the methyl group connected to the oxygen was dominant and observed in the v₃₀ = 2 state. This result was supported by considering the torsional force field in the same way as in the ground and the v₃₀ = 1 states. Over 800 lines up to J = 55 and K_a = 6 were assigned. The spectrum was analyzed using an IAM-like matrix formulation. Three rotational constants, eight centrifugal distortion constants, and four O-CH₃ internal rotation tunneling parameters were determined for the v₃₀ = 2 state. It was also made clear in the present analysis that the tunneling parameter dominant concerning the splitting due to the O-CH₃ internal rotation has the same sign as that of the v₃₀ = 1 state, and the sign opposite to that of the ground state.

 首次分析了骨架扭转v ₃₀ = 2状态下反式-甲基甲醚的微波吸收光谱。的反式-乙基甲基醚分子具有两个不等价的甲基内部转子。由于与氧连接的甲基而引起的分裂占主导，并在v ₃₀  = 2状态下观察到。通过以与地面和v ₃₀  = 1状态相同的方式考虑扭转力场来支持该结果。超过800行，直到J  = 55和K _a = 6被分配。使用类IAM的基质配方分析光谱。对于v ₃₀  = 2状态，确定了三个旋转常数，八个离心变形常数和四个O-CH ₃内部旋转隧穿参数。在本分析中还明确指出，与O-CH ₃内旋引起的分裂有关的隧穿参数优势与v ₃₀  = 1状态具有相同的符号，与基态具有相反的符号。 。