Wide application of spectral-analytical methods in industry and scientific researches makes the existence of spectral lines reference tables extremely important. Such manuals are the basic and primary material necessary for spectra identification. Normally, such manuals contain huge amount of information grouped according to certain characteristics in order to simplify the work. As a rule, in the spectral lines tables the data are grouped by waves lengths or by elements. Nevertheless, the search of information in such manuals takes a lot of time and there is a number of tasks that require other criteria for grouping and sorting the information. For example, the development of analytical methods requires selecting pairs of analytical lines with close excitation potentials. It is rather difficult to fulfill the task with the help of the book manual as you should look through and analyze large amounts of information.

Use of electronic databases helps fast search of the information by various criteria as well as grouping and sorting the data by given parameters.

Spectral lines tables [1] adopted for the electronic layout are considered to be the basis of information in the Spectra Heap database. In the tables [1] you find the lines selected for the aims of applied spectrography. The selection is based on the wide working experience of the authors [1] and the importance of the element as a basis of industrial materials or as an admixture of technological importance. The tables [1] contain relatively full lists of major elements spectral lines and are not overloaded by the weak lines abundance especially by the elements that are not widespread.

Though the basic data included in Spectra Heap database were taken [1] from the tables of Harrison [2] and Meggers [12], in Spectra Heap we give the references to all the sources of information used [1] in making up the tables and while creating Spectra Heap database.

The tables [1] consist of two parts. The first contains spectral lines sorted in the decreasing order of lines length and the second contains the lines sorted by elements. The data for these two parts were taken from different primary sources, describing various techniques, scales, etc. Since the structures of these tables are different (for example, different intensity scales are used) and to find the acceptable criteria, if there is any at all, of joining them together is extremely difficult, we decided to have them both in Spectra Heap. The data on lines (waves length) in these tables are overlapped approximately in 50 % (the information on 27834 lines is both in the first and in the second table). Therefore, tables can in some cases supplement each other. Thus, Spectra Heap database consists of two tables named "By Waves Lengths" and "By Elements".

The table "By Waves Lengths" is assigned for spectra decoding, qualitative spectral analysis and development of the quantitative analysis methods.

The table "By Elements" is important for the analysis of material cleanliness, searches of certain elements, choice of suitable lines for the analysis, and also for other scientific and practical tasks in the area of spectrography. In this connection, it is often important to know the character of line excitation. Therefore, the data concerning the lines' relation to atom or ion spectrum and excitation potential of a large amount of spectral lines are described in this paragraph.

The spectral lines of 60 elements are given in the table "By Waves Length". The table "By Elements" contains the spectral lines of 98 elements. At that, the general number of the given lines is 51 668 in the first table and 46 163 in the second. The spectrum area of the database is from 8000 up to 2000 Å, i.e. the area normally used in qualitative and quantitative spectral analysis.

The analysis of the whole set of the published data has shown, that the accuracy of waves lengths measurements does not allow to give their characteristics up to 0,001 Å. The differences in the data of different authors sometimes exceed 0,1 Å, and the differences in 0,02 - 0,03 Å are quite usual. Therefore, lines length parameters, but for normals, are given up to 0,01 Å, and you cannot consider the last figure to be reliable.

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