Table 1. Vibrational mode assignment and position for a-GST326, c-GST (both 225 and 326), t-GST, Sb₂Te₃ and GeTe.

Mode	(cm−1)	IR	Raman
a-GST
A1	120	no	yes
A1	148	no	yes
	210	no	yes
c-GST
T1u	70	yes	no
Eg	105	no	yes
	120	yes	no
A1g	160	no	yes
t-GST
A-type	45	no	yes
E-type	100	yes	yes
A-type	170	no	yes
Sb2Te3
Eg(1)	48	no	yes
Au(1)	62	yes	no
A1g(1)	67	no	yes
Eg(2)	113	no	yes
A1g(2)	165	no	yes
GeTe
E	79	yes	yes
A1	119	yes	yes

IR and Raman activity are specified. Note that the position of T_1u for c-GST is reported as the convolution of the two peaks at 60 cm⁻¹ (GST225) and 80 cm⁻¹ (GST326), according to Fig. 2. See text for details.