. "rydberg unit"@en-us . "113643894"^^ . . . "a wave number characteristic of the wave spectrum of each element"@en-us . "109808646"@en-us . . . "0"^^ . "13643894-n"^^ . "rydberg"^^ . . "rydberg"@en-us . "112872974"@en-us . "0"^^ . "rydberg constant"@en-us . . "a wave number characteristic of the wave spectrum of each element"@en-us . . . . . .