FSW

d 2ψ dx2 = − 2mE ~ 2 ψ = κ 2ψ , where κ = √ −2mE ~ .

ψ(x) = Ae−κx + Beκx

ψ(x) = F e−κx.

d 2ψ dx2 = − 2m(E + V0) ~ 2 ψ = −l 2ψ , where l = p 2m(E + V0) ~ .

− ~ 2 2m d 2 dx2 ψ(x) + V (x)ψ(x) = Eψ(x),

− ~ 2 2m d 2 dx2 ψ(−x) + V (x)ψ(−x) = Eψ(−x)

ψeven(x) = ψ(x) + ψ(−x)

ψodd(x) = ψ(x) − ψ(−x