Cs ülipeenstruktuuri siirdesagedus (symbol ∆νCs) on tseesium-133 aatomi põhiolekus toimuva häirimata ülipeenstruktuuri siirdesagedus, mis on oma olemuselt aatomiparameeter, ja mida võivad mõjutada keskkonnategurid, nt elektromagnetväljad. Kuid see siirdesagedus on siiski hästi mõistetav ja stabiilne ning praktilisest vaatepunktist hea valik tugisiirdeks.
The hyperfine transition frequency of Cs (symbol ∆νCs) is the frequency of the unperturbed ground-state hyperfine transition in the ground state of the caesium-133 atom; while it is inherently an atomic parameter, it can be influenced by environmental factors such as electromagnetic fields. Nevertheless, this transition frequency is well-understood and stable, making it a good choice for a reference transition from a practical standpoint.
∆νCs = 9 192 631 770 Hz is the value of the constant that is assumed to be invariant and on the basis of which 1 Hz = ∆νCs/9 192 631 770 ja 1 s = 9 192 631 770/∆νCs.
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