Polarized Raman Spectra of NH_𝟒Al(SO_𝟒)_𝟐⋅𝟏𝟐H_𝟐O

Table 3

Raman band positions and assignments of NH₄Al(SO₄)₂⋅12H₂O.

𝑧(𝑥𝑥)𝑧		𝑧(𝑥𝑦)𝑧		𝑍(𝑋^′𝑌^′)𝑍		𝑍(𝑋^′𝑋^′)𝑍		Assignment
Ag+Eg		Fg		Eg		Ag+Eg+Fg
11	m	11	m	—		11	m	Lattice modes
14	w	—		14	w	14	w
16	m	—		—		16	m
39	w	—		—		39	w
44	w	47	w	48	w	44	w
—		53	w	—		59	w
61	w	59	m	60	m	61	m
—		73	w	—		73	w
80	w	—		—		—
120	w	120	m	—		—		Trans of SO4^2−
159	s	153	m	—		159	m
—		186	m	167	m	—
193	s			196		193	m	Rota of SO4^2−
—		195	m	—
245	wbr	228	w	—		246	w	𝜈NH4-O
326	w	329	w	320	w	327	w
440	m	440	w	434	w	440	w	𝜈2SO4^2−
460	m	460	m	459	m	458	m
539	wbr	471	w	—		—
—		581	sh	—		—
615	s	610	s	614	s	614	s	𝜈4SO4^2−
		621	s	634	s
		632	m
		—
902	w			913	w	905	w	𝜈1SO4^2−
		915	s	986	s	990	s
990	vs	990	m	993	m	1099	m
1094	wbr	1034	m			1101	m
1104	s	1091	m	1102	m
1112	s	1102	s	1123	s	1131	m
1131	m	1130	m	1132	m	1134	m	𝜈3SO4^2−
−1190	m	—		—		1191	m
—		—		—
		—				1444	s	𝜈4NH4^+
1444	s			1453	s
				—		1540	s	𝜈2H2O
				—		1621	s	𝜈2NH4^+
						1750	s
1620	m	1617	mbr
1726	m	1738	wbr			2210	m
		—				2473	m
2442	w	—						𝜈1H2O
2482	w			2908	m	2920	m
				3072	m
2856	m	2936	m	—		3132	m
3103	m	—		—
3134	s	—		3338	m	3350	m
3356	mbr	3365	s			—		𝜈3H2O
						3400	wbr
3400	mbr	3376	s

s: strong; w: weak; m: medium; sh: shoulder; v: very; br: broad.