Strong dependence of the transition frequency on Z allows only a few opportunities for a spectrum of two-body atoms with Z 6= 1 and/or m 6= me . • In contrast, a number of transitions in neutral atoms Z = 1 are suited for laser spectroscopy.
Precision physics of simple atoms: QED tests, nuclear structure and fundamental constants
One can also consider more complex conﬁgurations of spin imbalance where the number of atoms in the two spin states is different (N↑ 6= N↓ ) as well as mixtures of atomic species with different masses (m↑ 6= m↓ ), including Fermi-Fermi and Bose-Fermi mixtures.
Theory of ultracold Fermi gases
We can also conclude, that the intensity of the peaks is determined by the number of C atoms in the chain which is conﬁrmed by comparing the intensities of the C8 and the C7 chains in Fig. 6.
Ab initio investigation of the groundstate, electronic, and optical properties of polyyne and cumulene prototypes
Equation (10) predicts that α 6= 0 due to contributions from the Coulomb and surface terms, whose relevance increases as the differences between the mass and/or the atomic numbers of the sources become larger.
Temperature effects in the nuclear isoscaling
The binding energy per nucleon is maximized for nucleons bound as a Fe nucleus. 6 These masses may be either nuclear masses or atomic masses, the electron number is conserved, and their binding energies are negligible, in comparison.
Introduction to Astronomy with Radioactivity