Table 2: Assigned feature carriers of the IR residue spectrum of the standard, Exp. OR1.
Feature label Position Carrier Vibration mode

cm^-1

a 3500-2300 R-COOH, alcohols, NH₄⁺ OH str., NH str.

b 3165 NH₄^+a ${\nu}_1$ + ${\nu}_5$ ^a

c 3035 NH₄^+a ${\nu}_2$ + ${\nu}_4$

d 2926 HMT^b 2 ${\nu}_{19}$ , ${\nu}_2 + {\nu}_{19}$

e 2876 HMT^b, NH₄^+a ${\nu}_{18}$ sym. CH₂ str., 2 ${\nu}_4$ of NH₄^+a

f 1742 Esters C=O str.

g 1680 Amides C=O str.

h 1586 COO^- in carboxylic acid salts COO^- antisym. str.

i 1463 NH₄^+a ${\nu}_4$ ^a

j 1375 HMT^b CH scissoring ^a

k 1320 COO^- in carboxylic acid salts COO^- sym. str.

l 1236 HMT^b ${\nu}_{21}$ CN str.

m 1085 HOCH₂COO^-

n 1007 HMT^b ${\nu}_{22}$ CN str.

o 918 carboxylic acid dimers OH def.

p 820 HMT^b NH₂ wag

q 765 Ammonium formate?

r 678 HMT^b, ammonium glycolate ${\nu}_{24}$ CNC def. (for HMT)

^a Wagner & Hornig (1950); ^b Bernstein et al. (1995).

**Table 2:** Assigned feature carriers of the IR residue spectrum of the standard, Exp. OR1.
Feature label	Position	Carrier	Vibration mode
	cm^-1
a	3500-2300	R-COOH, alcohols, NH₄⁺	OH str., NH str.
b	3165	NH₄^+a	${\nu}_1$ + ${\nu}_5$ ^a
c	3035	NH₄^+a	${\nu}_2$ + ${\nu}_4$
d	2926	HMT^b	2 ${\nu}_{19}$ , ${\nu}_2 + {\nu}_{19}$
e	2876	HMT^b, NH₄^+a	${\nu}_{18}$ sym. CH₂ str., 2 ${\nu}_4$ of NH₄^+a
f	1742	Esters	C=O str.
g	1680	Amides	C=O str.
h	1586	COO^- in carboxylic acid salts	COO^- antisym. str.
i	1463	NH₄^+a	${\nu}_4$ ^a
j	1375	HMT^b	CH scissoring ^a
k	1320	COO^- in carboxylic acid salts	COO^- sym. str.
l	1236	HMT^b	${\nu}_{21}$ CN str.
m	1085	HOCH₂COO^-
n	1007	HMT^b	${\nu}_{22}$ CN str.
o	918	carboxylic acid dimers	OH def.
p	820	HMT^b	NH₂ wag
q	765	Ammonium formate?
r	678	HMT^b, ammonium glycolate	${\nu}_{24}$ CNC def. (for HMT)

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