The vibration of the fluoroethane molecule is composed of 18 normal modes.
Flouroethane is in the CS point group with one symmetry element: σh reflection plane (cyan).
normal modes of the fluoroethane molecule
ν12(A'') | νasCH2
ν1(A') | νsCH3
ν13(A'') | νasCH2
ν2(A') | νsCH2
ν3(A') | νsCH3
ν4(A') | δsCH2
ν5(A') | δsCH2
ν14(A'') | δasCH3
ν6(A') | δsCH2CH3
ν7(A') | δsCH2CH3
ν15(A'') | δasCH2CH3
ν16(A'') | δasCH2CH3
ν8(A') | δsCH2CH3 and νCF
ν9(A') | νCC and νCF
ν10(A') | νCF and δsCH2CH3
ν17(A'') | δasCH2CH3
ν11(A') | δCCF
ν18(A'') | τCH3