Fig. 2

(a) Normal emission photoelectron spectra, obtained by integrating the photoemission intensity in a k_// range of 0 ± 0.025 Å⁻¹ at 10 K, using \(h\nu =60\)–72 eV. (b) Band dispersion obtained around the normal emission at \(h\nu =66\) eV. (c)–(e) Fermi level intensity maps obtained at 150 K, 70 K, and 20 K using \(h\nu =66\) eV. (f) is the intensity map obtained by superimposing the intensity of the Fermi level inside the first Brillouin zone (− 0.561 Å⁻¹ \(\le\) k_b \(\le\) 0.561 Å⁻¹, − 0.456 Å⁻¹ \(\le\) k_c \(\le\) 0.456 Å⁻¹), inside the second one (− 1.683 Å⁻¹ \(\le\) k_b \(\le\) − 0.561 Å⁻¹, − 0.456 Å⁻¹ \(\le\) k_c \(\le\) 0.456 Å⁻¹), and inside the fourth one (− 1.683 Å⁻¹ \(\le\) k_b \(\le\) − 0.561 Å⁻¹, − 2.278 Å⁻¹ \(\le\) k_c \(\le\) − 1.367 Å⁻¹).