Outside this system of units, the conversion factors between electronvolt, second, and nanometer are the following: ℏ ℏ = 1.054 571 817 646 × × 10 − − 34 J ⋅ ⋅ s = 6.582 119 569 509 × × 10 − − 16 e V ⋅ ⋅ s .