Solving Complex formula w/ Exponential & Exponential w/ Imaginary number

Can someone help me setup the attached formula in excel, I have attached the spreadsheet? I have Microsoft office 365. I can easily solve the equation in MathCad, but it's difficult to setup in Excel. The equation is unit-less since the units cancel one-another.

alpha =sqrt(R/S)*exp(-Beta*Omega*S/Vs)*imexp(-i*omega*S/Vs)

for S = 8
answer is -0.2369 + 0.1721i

for S = 10
answer is 0.2498i

Thanks