Temperature-controlled kinetics of the growth and relaxation of alcohol clusters in an argon matrix

Adsorption of intact methanol on Ru(0001)

“…6, F͒. The behavior of the OH stretch mode is again consistent with Pogorelov et al 35 In their work they observed that spectral lines, at 3378 and 3495 cm −1 , in the OH stretch region of methanol develop upon initial clustering ͑dimers, trimers, etc.͒. These lines are then replaced by a broad feature ͑3100-3500 cm −1 ͒ as the Ar matrix is heated to 45 K and larger clusters are formed.…”

“…2 at about 3200 cm −1 is in agreement with the calculated value for clustered methanol molecules. 34 Similarly, an experimental study of the clustering of four different monohydric alcohols, methanol to hexanol, in an Ar matrix in the temperature region of 20-45 K shows that the formation of methanol clusters gives a broad feature, 3100-3500 cm −1 , associated with the OH stretch in large clusters at 45 K. 35 The gradual vanishing of the peaks associated with the OH bend at 1304 and 1061 cm −1 ͑see Fig. 2, C-E͒ can likewise be explained by a clustering of isolated methanol molecules as the coverage increases.…”

FTIR/PCA study of propanol in argon matrix: The initial stage of clustering and conformational transitions

“…The most significant results on this field have been obtained using the vibrational spectroscopy (FTIR absorption and Raman) together with trapping/isolation in various cryogenic matrices [4][5][6][7][8][9][10][11][12][13][14]. This is mainly because the spectral acquisition carried out on isolated clusters at very low temperatures causes the appearance of narrow peaks with minimal band overlapping.…”

“…Continuing the studies on aggregation and relaxation processes of matrix-isolated alcohol molecules [7,13,14] the purpose of the present study was to analyze the FTIR spectra of 1-propanol molecules trapped in an argon matrix at continuously increasing temperature, viz., stepping by 1 K, from T = 11 K to 30 K, i.e., up to the onset of matrix evaporation that starts at 31 K. In order to improve the treatment of the experimental results the whole set of spectral data obtained under these conditions is processed applying the principal component analysis (PCA) with the sequent nonlinear curve fitting procedure. It is expected to obtain the novel set of data on the processes of molecular clustering and diffusion in a very initial stage as well as the conformational transitions at very low temperatures.…”

Effect of an argon matrix on the vibrational spectra of trapped water clusters

“…Метод матричної ізоляції дозволяє вивчати окремі молекули або невеликі структурні комплекси (кластери) досліджуваної речовини, нехтуючи їх взаємодією з оточуючим середовищем. Значна кількість робіт була присвячена спектроскопічним дослідженням особливостей структури кластерів воднево-зв'язаних рідин в матричній ізоляції (наприклад, [1][2][3][4]). В роботах [5,6] показано, що при температурі 9 К в спектрах ІЧ поглинання води, ізольованої в аргоновій матриці, чітко спостерігаються смуги, які відповідають мономерам та димерам, а з підвищенням температури матриці утворюються кластери більшого розміру.…”