Absorption spectra and isotope shifts of the (2, 0), (3, 1), and (8, 5) bands of the A²Π_u–X²∑_g⁺ system of ¹⁵N₂⁺ in near infrared

The high-resolution absorption spectra of the (2,0),(3,1),and (8,5) bands of the A²Π_u-X²∑_g⁺ system of ¹⁵N₂⁺ have been recorded by using velocity modulation spectroscopy technique in the near infrared region.The rotational constants of the X²∑_g⁺ and A²Π_u states of ¹⁵N₂⁺ were derived from the spectroscopic data.The isotope shifts of these bands of the A²Π_u-X²∑_g⁺ system of ¹⁴N₂⁺ and ¹⁵N₂⁺ were also analyzed and discussed.