Faculty of Physics
M.V.Lomonosov Moscow State University
Regular Article

# A Method for distinguishing between liquid samples by calculation of the initial moments using their infrared spectra

## A.V.Khakhalin$^{1,2}$, A.V.Koroleva$^1$, R.F. Khamidullina$^1$

### Moscow University Physics Bulletin 2015. 15. N 5. P. 397

• Article
Annotation

In this paper, a method for distinguishing between liquid samples that are sensitive to the influence of low-intensity physicochemical factors is described. It is based on the calculation of the initial moments of the intensity distribution series in their infrared spectra and comparison of the obtained values with each other. Reliable signs of the coincidence of liquid samples that were obtained in the experiment were used to distinguish distilled water at –0.5 ± 0.5 and –3.0 ± 0.5$^{\circ}$C, and at –3.0 ± 0.5 and –5.0 ± 0.5$^{\circ}$C, and to distinguish between distilled and tap water at 25.0 ± 0.5$^{\circ}$C. For each sample, the moments were calculated for the bending (1640 cm$^{–1}$), combination (2090 cm$^{–1}$), and stretching (3370 cm$^{–1}$) water absorption bands. It was found that when comparing distilled water at –0.5 ± 0.5 and –3.0 ± 0.5$^{\circ}$C the greatest differences are observed for the bending band (50%). When considering distilled water at –3.0 ± 0.5 and –5.0 ± 0.5$^{\circ}$C, the greatest differences occur for the stretching band (54%). When comparing distilled water at 25.0 ± 0.5$^{\circ}$C and tap water at 25.0 ± 0.5$^{\circ}$C, the greatest differences were observed for the bending band (86%).

Received: 2015 March 13
Approved: 2015 September 12
PACS:
33.20.Ea Infrared spectra
Rissian citation:
А.В.Хахалин, А.В.Королёва, Р.Ф. Хамидуллина.
Вестн. Моск. ун-та. Сер. 3. Физ. Астрон. 2015. № 5. С. 68.
Authors
A.V.Khakhalin$^{1,2}$, A.V.Koroleva$^1$, R.F. Khamidullina$^1$
$^1$Department of Physics, Moscow State University, Moscow, 119991 Russia
$^2$Institute of Nanotechnology of Microelectronics, Russian Academy of Sciences, Moscow, 119991 Russia

### Science News of the Faculty of Physics, Lomonosov Moscow State University

This new information publication, which is intended to convey to the staff, students and graduate students, faculty colleagues and partners of the main achievements of scientists and scientific information on the events in the life of university physicists.