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# sknano.structures.compute_Ch¶

sknano.structures.compute_Ch(*Ch, *, bond=None, **kwargs)[source][source]

Compute nanotube circumference $$|\mathbf{C}_{h}|$$ in .

$|\mathbf{C}_h| = a\sqrt{n^2 + m^2 + nm} = \sqrt{3}a_{\mathrm{CC}}\sqrt{n^2 + m^2 + nm}$
Parameters: *Ch : {tuple or ints} Either a 2-tuple of ints or 2 integers giving the chiral indices of the nanotube chiral vector $$\mathbf{C}_h = n\mathbf{a}_1 + m\mathbf{a}_2 = (n, m)$$. bond : float, optional Distance between nearest neighbor atoms (i.e., bond length). Must be in units of Å. Default value is the carbon-carbon bond length in graphite, approximately $$\mathrm{a}_{\mathrm{CC}} = 1.42$$ Å float Nanotube circumference $$|\mathbf{C}_h|$$ in Å.