Refractive index of 4 glycols versus wavelength and temperature

The dataset consists of tables of refractive index values versus wavelength and temperature n(lambda, T) for 4 hygroscopic organic liquids. Each table corresponds to one liquid: (i) HEG – hexaethylene glycol, 96% abcr GmbH lot 1508060; (ii) PEG – pentaethylene glycol, 98.0%, Alfa Aesar lot 10207595 and pentaethylene glycol, 97.0%, abcr GmbH lot 1509179 (no differences in measurements were found) ; (iii) TPG – tripropylene glycol, ≥99%, Alfa Aesar lot H25W018; (iv) DPG – dipropylene glycol, mixture of isomers, 99%, Alfa Aesar lot 10201331. The measurements cover the range from 390 to 1070 nm in wavelength and from 1 to 45ºC in temperature. Each data point corresponds to a mean value of several measurements. Outlier measurement series were discarded. The accuracy of the refractive index measurement is estimated to be ±0.0003, while the accuracy of the wavelength measurement is ~1%, and the accuracy of the temperature measurement is ±0.5 K. The measurements were performed with a modified Abbe refractometer. The calibration was performed with water at each temperature from 5 to 45ºC and with ethylene glycol at 1ºC. The details of experimental setup and procedures can be found in [Jakubczyk et al., Chromatic dispersion and thermal coefficients of hygroscopic liquids: 5 glycols and glycerol, Scientific Data, (2023) 10:894, DOI: 10.1038/s41597-023-02819-3]. The SketchUp file (.skp, 2017 format) contains the corresponding 3D model, while the .mp4 file contains a walk-around video of the setup, generated from the model.

本数据集收录了4种吸湿性有机液体的折射率随波长与温度变化的数值表n(λ, T)。每个表格对应一种受试液体：
(i) 六乙二醇（Hexaethylene Glycol, HEG）：纯度96%，购自abcr GmbH，批号1508060；
(ii) 五乙二醇（Pentaethylene Glycol, PEG）：包含两个批次，分别为Alfa Aesar公司生产的98.0%纯度批号10207595，以及abcr GmbH公司生产的97.0%纯度批号1509179，经检测二者的测量结果无显著差异；
(iii) 三丙二醇（Tripropylene Glycol, TPG）：纯度≥99%，购自Alfa Aesar公司，批号H25W018；
(iv) 二丙二醇（Dipropylene Glycol, DPG）：异构体混合物，纯度99%，购自Alfa Aesar公司，批号10201331。
本次测量覆盖的波长范围为390 nm至1070 nm，温度范围为1 ℃至45 ℃。每个数据点均为多次独立测量的平均值，异常测量序列已被剔除。
经评估，本次折射率测量的准确度为±0.0003，波长测量准确度约为1%，温度测量准确度为±0.5 K。所有测量均采用改装后的阿贝折射仪（Abbe refractometer）完成。校准流程如下：在5 ℃至45 ℃的各温度下以纯水进行校准，同时在1 ℃下以乙二醇完成校准。
实验装置与测量流程的详细细节可参见文献：Jakubczyk 等, 《吸湿性液体的色散与热系数：5种二醇与甘油》, Scientific Data, 2023, 10:894, DOI: 10.1038/s41597-023-02819-3。
配套文件包含SketchUp格式文件（.skp，2017版本），其中存储了对应实验装置的三维模型；另有一个.mp4格式文件，包含由该模型生成的装置环视视频。